Browsing by Author "Wang, Chia-Sheng"

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AlGaInP Red LEDs with Hollow Hemispherical Polystyrene Arrays
(2018-01-17)
Cheng, Wen-Ching
;
Huang, Shih-Yung
;
Chen, Yi-Jiun
;
Wang, Chia-Sheng
;
Lin, Hoang Yan
A hollow hemispherical polystyrene (HHPS) was fabricated to reduce total internal reflection in AlGaInP-based LEDs. At an injection current of 350 mA, the external quantum efficiencies of LED-I, LED-II, LED-III, and LED-IV are 20.92%, 24.65%, 27.28%, and 33.77% and the wall-plug efficiencies are 17.11%, 20%, 22.5%, and 27.33%, respectively. The enhanced performance is attributed to the light output power enhancement through the surface roughness, microlens-liked PS hemisphere, and scatter-liked HHPS array. In this paper, the rigorous coupled wave analysis (RCWA) numerical method was also conducted to demonstrate the HHPS array effectively enlarge the effective light cone.
Integration of Imprinting with Reflector for Designing High Efficiency Street-Lamp Module
(2010)
Pan, Jui-Wen
;
Tu, Sheng-Han
;
Fan, Chen-Wei
;
Lin, Sheng-Han
;
Huang, Jiun-Yang
A cost effective, high throughput, and high yield method for street lamp was proposed in this paper. We integrated the imprinting technology and the reflective optical element to improve the conventional street lamp. The novel design has 40% enhancement in illumination intensity, the uniform illumination and the glare effect elimination.