Session Index

Solid State Lighting

Poster Session I
Thursday, Dec. 7, 2017  12:30-14:00
Presider: -
Room: International Research Building 5F
Notes:
Paper No.  2017-THU-P0801-P001
Jyun-Yu Lin Non-Rare-Earth Element Based on High Quantum Efficiency Organic Materials Used for Warm Light LED
Jyun-Yu Lin;Tsung -Yo Tsai;Ching-Fuh Lin

In this study, we presented non-rare-earth phosphor powder used for WLED. The CRI of mixture of the green-yellow and red phosphor powder is 88.2. Moreover, the CCT of these phosphor powder is 5190 K which is suitable for indoor lighting at night.

 
 
Paper No.  2017-THU-P0801-P002
Po-Hsun Liao UV LEDs grown on GaN templates with selective-area Si implantation for enhancing light output power
Po-Hsun Liao;Hsin-Yen Cheng;Ming-Lun Lee;Jinn-Kong Sheu

GaN-based UV LEDs grown on GaN templates with Si-implanted stripes were studied. The GaN-based layers regrown on the Si-implanted templates exhibited selective-area and lateral growth. It was attributed to the difference of lattice constant between the Si-implanted and implantation-free regions. The UV LEDs with Si-implanted GaN exhibited higher output power.

 
 
Paper No.  2017-THU-P0801-P003
Jian-Yu Shen Study on White Light LED Spectral Characteristics of Underwater Illumination
Jian-Yu Shen;Tsung-Xian Lee;Chih-Hsuan Tsuei

In this paper, the spectral energy change of white light LEDs of underwater illumination is simulated and analyzed . The simulation results showed the highly positive relationship between spectral energy decay, extinction coefficient and Mie scattering of sea water.

 
 
Paper No.  2017-THU-P0801-P004
Su Yin Yan Tuning the Correlated Color Temperature of White Light-Emitting Diode with Liquid Crystal Modulator
Su Yin Yan;Ping Shang Ying;Kuei Han Fu

We proposed a liquid crystal modulated white LED in this study. The liquid crystal cell in the structure is partially aligned, and could be used to adjust the blue light hitting the red phosphor region and then provide the white light with different CCT.

 
 


Solid State Lighting

Solid State Lighting I
Thursday, Dec. 7, 2017  13:00-14:45
Presider: Hao-Chung Kuo
Room: International Research Building IR5034(5F)
Notes:
13:00 - 13:30 Paper No.  2017-THU-S0801-I001
Invited Speaker:
James S. Speck
Development of High Performance (0001) LEDs: Tunnel Junctions and Green LEDs
James S. Speck

"In this presentation, we highlight two recent areas of development of high performance c-plane GaN-based LEDs Tunnel Junctions: Efficient tunnel junctions (TJ) provide a means of carrier conversion between p-type and n‐type material in semiconductor devices and are potentially advantageous for the III‐Nitride material system, where the poor conductivity of p‐GaN impacts the design and efficiency of light emitting and laser diodes (LEDs and LDs). We have developed a technologically viable hybrid growth approach that involves growing the active region of devices and top p‐GaN layers by the standard (MOCVD) growth technique, followed by growth of the highly doped n-side of the TJ by ammonia‐assisted molecular beam epitaxy. We have successfully realized high performance VCSELS, edge emitting laser diodes, and LEDs. For LEDs the high conductivity and low optical loss of n-type GaN enables new designs that effectively increase the light extraction efficiency. We present c-plane 450 nm LEDs with a peak EQE and WPE of 76% and 73%, respectively.Green LEDs: We demonstrate very high luminous efficacy MOCVD growth of green light-emitting diodes that employ high temperature InGaN QW growth immediately followed by an Al0.30Ga0.70N cap layer and then a higher temperature GaN barrier. The peak external quantum efficiency and luminous efficacies were 44.3% and 239 lm/W, respectively. "

 
 
13:30 - 13:45 Paper No.  2017-THU-S0801-O001
Jiun-Woei Huang The design of uniform light source of UV LED for directing writing lithography
Jiun-Woei Huang;Luh-hua Chen

The illumination design is for a PC board aligner. Koehler illumination is applied to transfer from the wide divergent angle and non-uniform source to the smallest divergent angle and uniform source.

 
 
13:45 - 14:00 Paper No.  2017-THU-S0801-O002
Zi-Xuan You 2-Gbit/s of Photonic Crystal Light-emitting Diodes on Visible Light Communication
Zi-Xuan You;Tung-Ching Lin;Jian-Jang Huang

GaN based light-emitting diodes (LEDs) have shown its potential on visible light communication (VLC). However, the bandwidth is always the bottleneck for LEDs on high-speed application. In this work, we proposed 2-Gbps data rate of GaN based LEDs with photonic crystal (PhC) structure which improves the performance of VLC system.

 
 
14:00 - 14:15 Paper No.  2017-THU-S0801-O003
Tzu-Yu Chen White Light-Emitting Diode with Excellent Color Quality based on Liquid type Nontoxicity Photoluminescent Nano-materials
Tzu-Yu Chen;Hao-Chung Kuo

White-light-emitting diodes fabricated by Nontoxic nanomaterials graphene ,porous silicon quantum dots , which could achieve high color rendering index 95 and high-brightness. Liquid-type white LED structure reduce surface temperature and improves the luminous efficiency. Distributed Bragg reflector can enhance it by incorporating the brightness of an LED.

 
 
14:15 - 14:30 Paper No.  2017-THU-S0801-O004
Chih-Ming Weng Wavelength Tunable InGaN/GaN Nano-ring Light-emitting Diodes by Nanosphere Lithography
Chih-Ming Weng;Hao-Chung Kuo

Nano-ring light emitting diodes with different wall width demonstrates that the effective bandgaps can be tuned by reducing the strain inside the active region. This research shows the NRLEDs devices with four-color emission on the same wafer.

 
 
14:30 - 14:45 Paper No.  2017-THU-S0801-O005
Huang Che Hsuan High efficiency and low assemble-dependent chip-scale package for white light-emitting diodes
Huang Che Hsuan

This study presents the chip-scale package (CSP) structure with the conformal and uniform structure for white LED in lighting and BLU applications. The simulated results show that the CSP structure enhances the efficacy from SMD type by 8.81% and 9.43% at lighting and BLU applications respectively.

 
 


Solid State Lighting

Solid State Lighting II
Thursday, Dec. 7, 2017  15:15-17:00
Presider: Tien-Chang Lu
Room: International Research Building IR5034(5F)
Notes:
15:15 - 15:30 Paper No.  2017-THU-S0802-O001
Chia-Yen Huang Spectrally-pure deep-UV electroluminescence on thick AlGaN template with an improved surface morphology
Chia-Yen Huang;Kai-Hsiang Chang;Xi-Cheng Huang;Ray-Ming Lin;Hao-Chung Kuo

: We demonstrated a AlGaN-based light-emitting diode epitaxial structure with spectrally-pure electroluminescence. The key element is to maintain the surface morphology after growing a micron-thick n-AlGaN as the n-contact layer. The growth conditions and interfacial treatment of multiple-quantum-wells have a strong influence on the suppression of defect luminescence.

 
 
15:30 - 15:45 Paper No.  2017-THU-S0802-O002
Hung-Hsiang Chen 2D Transport Modeling and Optimization of p-type AlGaN Supper Lattice for Deep UV Light Emitting Diodes
Hung-Hsiang Chen;Yuh-Renn Wu

For a 280nm UVLED, p-AlGaN super lattice (SL) is used as the contact layer to decrease light absorption and a pattern structure is used to enhance the light extraction. An optimized UVLED structure is found to improve contact and remained transparent for UVLEDs.

 
 
15:45 - 16:00 Paper No.  2017-THU-S0802-O003
Shih-Kang Lin White LEDs with Correlated color temperature Self-Balancing Mechanism from Turn-on Stage to Thermal Equilibrium
Shin-Mei Wu;Shih-Kang Lin;Tsung-Hsun Yang;Benoit Glorieux;Xuan-Hao Lee;Ching-Yi Chen;Yu-Yu Chang;Yeh-Wei Yu;Ching-Cherng Sun

We propose a method that can inhibit CCT drift by finding a well match design between the blue die and the phosphor for the unavoidable thermal effect. The method is a passive way to keep self-balancing between the blue and yellow lights in the normal operation duration.

 
 
16:00 - 16:15 Paper No.  2017-THU-S0802-O004
Chih-Ching Cheng Integration of Gallium Antimonide Structures on Silicon Substrate by Rapid Melt Growth Method
Chih-Ching Cheng;Jing-Wen Jheng;Yi-Hsun Chen;Cheng-Yu Lin;Chih-Kuo Tseng;Yin-Jui Chen;Keh-Yung Cheng;Kuang-Chien Hsieh;Ming-Chang M. Lee

Structures made of III-V semiconductor Gallium Antimonide (GaSb) integrated on silicon substrate by Rapid Melt Growth (RMG) method are investigated. Due to the small electronic bandgap (0.72 eV), GaSb could be an ideal material to implement an integrated light source for silicon photonics.

 
 
16:15 - 16:30 Paper No.  2017-THU-S0802-O005
Chih-Hao Lin High Quality Liquid-type White Light-Emitting Diode with Zn0.8Cd0.2S White Quantum Dots
Chih-Hao Lin;Chin-Wei Sher;Huang-Yu Lin;Subadra Kamankottai Balasekaran;Hao-Chung Kuo

This study demonstrates a colloidal ternary Zn0.8Cd0.2S white quantum dots prepared by chemical route and dispersed in xylene liquid-type WQD solution integrates it with standard UV-LED to form liquid-type WQD-WLED. High efficiency, high color quality and excellent reliability of LWQD-WLED with neutral white CCT can be obtained.

 
 


Solid State Lighting

Poster Session II
Thursday, Dec. 7, 2017  15:30-17:00
Presider: -
Room: International Research Building 5F
Notes:
Paper No.  2017-THU-P0802-P001
Guan-Wen Lai Color-stablized light-extraction films for organic light-emitting diodes
Yu-Zhang Lai;Hsin-I Chen;Su-Hua Chen;Mao-Kuo Wei;Guan-Wen Lai

Oxide nanoparticles, polymethylmethacrylate and surface modification agent were mixed to form light-extraction microstructures on glass substrates. Light-extraction films can improve luminous current efficiency and efficacy of the organic light emitting device up to 49% and 35%, respectively. The maximum variations of CIE-indices are only 0.001 in the studied view angles.

 
 
Paper No.  2017-THU-P0802-P002
Jyun-Yu Lin Using Aqueous Solution Method to Develop High Quantum Efficency Green-Yellow Phosphor
Tsung -Yo Tsai;Jyun-Yu Lin;Ching-Fuh Lin

In this research, we explored a high quantum efficiency green-yellow phosphor through the aqueous solution method. By concentration quenching effect, the emission wavelength of green-yellow phosphor can be tuned between 545nm and 534nm. Furthermore, the quantum efficiency of green-yellow phosphor can reach 88.2 %.

 
 
Paper No.  2017-THU-P0802-P003
Sheng-Chieh Lin Bottom emission organic light-emitting diode with strong cavity
Sheng-Chieh Lin;Mei-Tan Wang;Jung-Yu Li;Shih-Pu Chen;Yi-Ping Lin;Hong-Hui Hsu;Guan-Yu Chen;Tien-Lung Chiu;Chi-Feng Lin;Jiun-Haw Lee

A strong-cavity organic light-emitting diode was demonstrated with bottom emission configuration by incorporating thin-Al/MoO3 between the indium-tin-oxide anode and organic layer

 
 


Solid State Lighting

Poster Session III
Friday, Dec. 8, 2017  12:30-14:00
Presider: -
Room: International Research Building 5F
Notes:
Paper No.  2017-FRI-P0803-P001
Fu-Hai Yang Photoluminescence investigation of green-emitting magnesium stannate phosphors
Mu-Tsun Tsai;Fu-Hai Yang

We experimentally investigate the photoluminescence properties of un-doped and Mn-doped Mg2SnO4 (MTO) powder phosphors via a sol–gel process. The intrinsic luminescence of MTO exhibits green-light emission under UV excitation. Significant enhancement in emission intensity was demonstrated for the MTO:Mn phosphors.

 
 
Paper No.  2017-FRI-P0803-P002
Xung Jing Peng The Characteristics of Double Ring Remote Phosphor Geometry for Phosphor-Converted Light-Emitting Diodes
Xung Jing Peng;Ping Shang Ying

The characteristics of double ring remote geometry for phosphor-converted light-emitting diodes are proposed in this study. The optical characteristics of the mixed and double ring remote pcLEDs with different phosphor concentration are discussed.

 
 
Paper No.  2017-FRI-P0803-P003
Yu-Chun Liu Development of Adaptive One-dimensional Drift-diffusion Charge Control Solver TCAD Tool for Optoelectronic Device Modeling
Yu-Chun Liu;Chien-Hsien Lin;Bor-Hann Huang;Yuh-Renn Wu

The Python based User friendly DDCC-CAD tool for solving drift-diffusion charge-control solver developed by NTU and ITRI is presented here. An adaptive algorithm approach will be applied and tested. The goal is to assist users automatically fitting the experimental results and find the optimized solutions of optoelectronic devices.

 
 
Paper No.  2017-FRI-P0803-P004
Ya-Xun Lin Self-assembly of microlens arrays using spin-coating process and their optical properties
Ya-Xun Lin;Shao-Ju Lin;Su-Hua Chen;Mao-Kuo Wei

10-um surface-modified silica microspheres, organic solvent and polymethylmethacrylate were used to fabricate self-assembled microlens arrays on glass substrates. The microlens arrays can improve luminous efficacy of organic light-emitting devices more than 40%. Their optical properties including CIE indices and spectra were also investigated.

 
 


Solid State Lighting

Solid State Lighting IV
Friday, Dec. 8, 2017  13:00-14:30
Presider: Chia-Yen Huang
Room: International Research Building IR5034(5F)
Notes:
13:00 - 13:30 Paper No.  2017-FRI-S0803-I001
Invited Speaker:
Hideto Miyake
Fabrication of high-quality AlN on sapphire be face-to-face annealingFabrication of high-quality AlN on sapphire be face-to-face annealing
Hideto Miyake

The annealing of sputtered AlN films with different thicknesses grown on sapphire in nitrogen ambient was investigated. In the annealing, two AlN films on sapphire were overlapped “face-to-face” to suppress the thermal decomposition of the AlN films. The sputtered AlN films with small grains consisted of columnar structure were initially aligned with (0002) orientation but became slightly inclined with increasing film thickness resulting in the formation of a two-layer structure. After annealing, films became a single crystalline layer regardless of the film thickness, and their crystallinity markedly improved after annealing at 1700 oC. The full widths at half maximum of the (0002)- and (10-12)-plane X-ray rocking curves were improved to 30-50 and 200-250 arcsec, respectively.This work was partially supported by JSPS KAKENHI Grant Numbers 15H03556 and 16H06415, and JST CREST No. 16815710, JST SICORP InRel-NPower – EU H2020 No. 720527, and JST SICORP with MOST in China.

 
 
13:30 - 13:45 Paper No.  2017-FRI-S0803-O001
I-Chen Tseng High-Speed 2x2 Integrated Micro-LED Array for Visible Light Communication
I-Chen Tseng;Hao-Yu Lan;Chao-Hsin Wu

The high-speed blue micro-LEDs employed in a 2x2 integrated array configuration can achieve much higher light-output (3.3x) without sacrificing the speed (280 MHz). We will discuss the dc and high-speed characteristics and the eye diagram of the single micro-LED and the micro-LED array

 
 
13:45 - 14:00 Paper No.  2017-FRI-S0803-O002
Yao-Pin Wang GaN-based vertical-cavity surface-emitting lasers operating at high temperature
Tien-Chang Lu;Yao-Pin Wang

We demonstrated GaN-based VCSELs operating at high temperature. The VCSELs contain double dielectric DBRs and epitaxial layers deposited on c-plane sapphire substrates that are bonded to silicon substrates with p-side-down configuration, contributing to better heat dissipation. The temperature dependent lasing characteristics revealed that the VCSELs can sustain to 350K.

 
 
14:00 - 14:15 Paper No.  2017-FRI-S0803-O003
Yu-Wei Hsu Grating-Based Tunable Laser by Using Cr4+:YAG Crystal Fiber as Gain Media
Yu-Wei Hsu;Dong-YO Jheng

Tunable laser from 1399 to 1514 nm was demonstrated with the Cr4+:YAG fiber. The laser output wavelength was tuned by rotating a grating. We also proposed designs of high-index-glass-clad Cr4+:YAG crystal fibers which can achieve few-mode guiding at the wavelength 1.64 μm.

 
 
14:15 - 14:30 Paper No.  2017-FRI-S0803-O004
Yu-Cheng Shen Optical Model for QD-LEDs
Yu-Cheng Shen;Yao-Chung Hsiao;Tsung-Hsun Yang;Yeh-Wei Yu;Ching-Cherng Sun

In this work, we have extensively explored the optical emission of the red quantum dots illuminated by blue LED die. The emission spectra of the QDs are found of red shifting as the concentrations of the QDs increasing. We conclude an empirical model for the red shifting.

 
 


Solid State Lighting

Poster Session IV
Friday, Dec. 8, 2017  14:30-16:00
Presider: -
Room: International Research Building 5F
Notes:
Paper No.  2017-FRI-P0804-P001
Fan Bo-An Non-doped organic light-emitting diode with broadband emission
Fan Bo-An;Hou Liang-Ju;Leung Man-kit;Lin Chi-Feng;Chiu Tien-Lung;Lee Jiun-Haw

Organic light-emitting diode with broadband emission was demonstrated with a non-doped emitting layer. Electroluminescence covering 450 nm to 700 nm under different driving voltage was achieved.

 
 
Paper No.  2017-FRI-P0804-P002
Wei Hao Zeng The Photophysical Properties of Triazolopyridine Hybrids with Bipolar Carrier Transporting Capability for Organic Light-emitting Diodes
Wei Hao Zeng

The photophysical properties of newly developed triazolopyridine hybrids with bipolar carrier transporting capability have been studied. The spectrum overlap between the emission of trizolopyridine hybrids and the absorption of green-phosphorescent dopant Ir(PPy)3 is large enough for energy transfer. Therefore, the triazolopyridine hybrids would be useful as green-phosphorescent host materials.

 
 
Paper No.  2017-FRI-P0804-P003
Kun-Min Hsieh Optical Properties of Flexible Substrates for White Organic Light-emitting Diodes
Kun-Min Hsieh

Flexible poly substrates have been fabricated for white organic light-emitting diodes. The transmittance of the flexible PMMA substrates has also been studied in this work. The PMMA substrates show high transparency to visible light. Phosphor crystals will be blended into the PMMA substrates as the color-conversion substrates for WOLEDs.

 
 
Paper No.  2017-FRI-P0804-P004
You-Cheng Lin To Enhance Light Extracting of AlGaInP LED by Surface Texture Process
You-Cheng Lin;Ray Hua Horng

In this study, the light extraction of the red AlGaInP LED was enhanced due to the total reflection between light emitting p-GaP interface and air was reduced by surface texture process which was formed by dry/wet etching process, and light extraction efficiency was improved significantly by this process.

 
 


Solid State Lighting

Solid State Lighting V
Friday, Dec. 8, 2017  14:50-16:20
Presider: Li-Yin Chen
Room: International Research Building IR5034(5F)
Notes:
14:50 - 15:05 Paper No.  2017-FRI-S0804-O001
Jun-Yu Huang Modeling of carrier transport in Organic Light Emitting Diodes by 2D Random Doping Model
Jun-Yu Huang;Te-Jen Kung;Yuh-Renn Wu

Poisson and drift-diffusion solver is used with effective density of state and Poole-Frenkel mobility model to simulate OLEDs. Influence of doping density to the effective field dependent mobility was predicted with 2D random dopant model and was successfully applied to 1D simulation. Different doping to transport is well modeled.

 
 
15:05 - 15:20 Paper No.  2017-FRI-S0804-O002
Amanuel Assefa Kassa Simulating Organic LED strips for lighting and VLC
Amanuel Assefa Kassa;Po-Jui Chen;Xuan Long Ho;Jonathon David White

Organic LED strip lighting, with picosecond fluorescent lifetimes, is shown to simultaneously provide high quality uniform shadow-free diffuse lighting at low cost while allowing Visible Light Communication speeds of 0.3-0.6 Mbps without filters for a 5x5x3m3 room.

 
 
15:20 - 15:35 Paper No.  2017-FRI-S0804-O003
Bo-Lin Huang Simulation of Localized Surface Plasmon Resonance in Organic Light Emitting Diodes by Random Particle Model
Bo-Lin Huang;An-Chi Wei

This research studies the effect of localized surface plasmon resonance (LSPR) for enhancing the OLED luminous efficiency. We build an electromagnetic wave model with random particle distribution and simulate the absorption spectrum of OLED to optimize the structure of the nano-particle layer.

 
 
15:35 - 15:50 Paper No.  2017-FRI-S0804-O004
Tzo-Guo Hu Optimal LED Spectra
Tzo-Guo Hu;Tsung-Hsun Yang;Yeh-Wei Yu;Ching-Cherng Sun

We have successfully obtained the optimal LED spectra of the highest CRI for warm and cool white. By an empirical spectral function describing the LED spectra with high accuracy, the optimal LED spectrum can be easily evaluated. The optimal LED spectra for the highest CRI of various CCTs is concluded.

 
 
15:50 - 16:05 Paper No.  2017-FRI-S0804-O005
Jun-Yi Wu Achromatic Design of Packaging Lens in White Light LED
Jun-Yi Wu;Shih-Hsin Ma

In this study, the white light LED with an achromatic packaging lens which is composed by three different mediums is proposed. The shapes of the interfaces in the packaging lens are designed. According to the results of design, the achromatic packaging lens can reduce the color dispersion obviously.