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15:30 - 15:45
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Paper No. 2014-Thu-S0802-O003
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| Yen-Hsiang Hsu
Award Candidate
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Nanoscale epitaxial lateral overgrowth of GaN-based light-emitting diodes on an AlN nanorod-array template
Yen-Hsiang Hsu,Chen-Hung Tsai,Yu-Feng Yin,Hsiang-Wei Li,Wei-Chih Lai,JianJang Huang,
We propose an AlN nanorod template grown on sapphire substrate using vapor-liquid-solid (VLS) method. The corresponding material quality, including voids near nanorods, Raman spectra and transmission electron microscopy (TEM) images, indicates significant improvement. Internal quantum efficiency (IQE) of the device with the proposed AlN nanorod template increases 12.2% as compared with the reference sample without AlN rod.
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15:45 - 16:00
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Paper No. 2014-Thu-S0802-O004
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| Cheng-Han Wu
Award Candidate
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Voltage modulation of a tunnel junction light-emitting transistor via photon-assisted tunneling
Cheng-Han Wu,Chao-Hsin Wu,
We demonstrate the voltage modulation of a tunnel junction light-emitting transistor (TJLET) via Franz-Keldysh photon-assisted tunneling. The base-collector tunnel junction can be effectively controlled by the change of voltage. A resonant optical modulation bandwidth up to 7.6 GHz is obtained when the TJLET is operated in negative differential resistance region.
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16:00 - 16:15
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Paper No. 2014-Thu-S0802-O016
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| Ming-Shiou Tsai
Award Candidate
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Spatial-color Model for Light Distribution of Phosphor-converted White LEDs
Ming-Shiou Tsai,Yu-Yu Chang,Yu-Huan Wang,Ching-Yi Chen,Yi-Chien Lo,Chien-Hung Hsu,Ching-Cherng Sun,
A modeling algorithm is proposed for pcW-LEDs, and it can be applied to accurately simulate color appearances, potentially enabling optical designers to remove yellowish/bluish spots in LED lighting. The developed optical model can predict the behavior of light sources with adding TIR lens. Accordingly, the color uniformity is improved with the appropriate optical design.
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16:15 - 16:30
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Paper No. 2014-Thu-S0802-O017
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| Shih-Yu Tu
Award Candidate
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Speckle suppressed blue laser light in a micro-vibrated phosphor paper
Shih-Yu Tu,Hoang Yan Lin,Tsung-Xian Lee,
In this paper, we have demonstrated an efficient speckle suppressed technique for a blue laser light in a micro-vibrated phosphor paper. The speckle contrast could be reduced from 51% to 7.4%. A mixing speckle contrast is defined for LD pumped phosphor material. The almost speckle-free result is achieved.
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16:30 - 16:45
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Paper No. 2014-Thu-S0802-O030
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| Chung-cheng Hsu
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3D Finite Element Strain Analysis of InGaN Quantum Well with Indium Fluctuations
Chung-cheng Hsu,Yuh-Renn Wu,
In this paper, we developed a 3-D finite element method for the strain calculation. With this program, it is able to calculate the strain distribution inside a quantum well (QW). We analyzed the strain distribution of nanowire based QW with indium fluctuation and compare the difference with the ideal normal nanowire QW. With this method, it is possible for us to accurately estimate the piezoelectric polarization inside the quantum well.
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16:45 - 17:00
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Paper No. 2014-Thu-S0802-O031
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| Yi-Ju Wu
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General Method for Freeform Lens Design in White Light-Emitting Diodes
Yi-Ju Wu,Li-Yin Chen,
In this study, we proposed a general method for freeform lens design in white light-emitting diodes. The design method was then verified by Monte Carlo ray tracing system. The simulation result shows a huge improvement on illuminance uniformity, from 35.4% to 94.3%.
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17:00 - 17:15
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Paper No. 2014-Thu-S0802-O038
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| Jhih-You Cai
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A Novel Lighting Design of Optical-adjustable Illumination with Surface-structured Diffuser by Index-matching Liquid
Jhih-You Cai,Xuan-Hao Lee,Chi-Shou Wu,Kuan-Hung Lee,Tsung-Hsun Yang,Ching-Cherng Sun,
In this research, a novel lighting design for a different requirement target area is proposed. With the index-matching liquid, the micro lens array of surface structure diffuser is compensated through a certain level of index matching so that the illumination pattern is adjustable.
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