Special Section on Solid-State Lighting: Photonics and Technologies

Luminous efficiency enhancement of white light-emitting diodes by using a hybrid phosphor structure

[+] Author Affiliations
Bing-Cheng Lin, Jhih-Kai Huang, Kuo-Ju Chen, Sheng-Huan Chiu, Zong-Yi Tu, Po-Tsung Lee, Hao-Chung Kuo

National Chiao Tung University, Institute of Electro-Optical Engineering, Department of Photonics, No. 1001, University Road, Hsinchu 30010, Taiwan

Chien-Chung Lin

National Chiao Tung University, Institute of Photonics System, No. 301, Gaofa 3rd Road, Guiren District, Tainan 71150, Taiwan

Min-Hsiung Shih

Academia Sinica, Research Center for Applied Sciences, No. 128 Academia Road, Sec. 2, Nankang, Taipei 115, Taiwan

Industrial Technology Research Institute, Green Energy and Environment Research Laboratories, 195, Sec. 4, Chung Hsing Road, Chutung, Hsinchu 31040, Taiwan

Mei-Tan Wang, Jung-Min Hwang

National Sun Yat-sen University, Department of Photonics, 70 Lienhai Road, Kaohsiung 80424, Taiwan

J. Photon. Energy. 5(1), 057603 (Feb 19, 2015). doi:10.1117/1.JPE.5.057603
History: Received October 28, 2014; Accepted December 4, 2014
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Abstract.  This paper presents a “hybrid” structure for the coating of yellow YAGCe3+ phosphor on blue GaN-based light-emitting diodes (LEDs). The luminous efficiency of the hybrid phosphor structure improved by 5.9% and 11.7%, compared with the conventional remote and conformal phosphor structures, respectively, because of the increased intensity of the yellow component. The hybrid structure also has an advantage in the phosphor usage reduction for the LEDs. Furthermore, the electric intensity of the hybrid phosphor structure was calculated for various thicknesses by conducting TFCalc32 simulation, and the enhanced utilization of blue rays was verified. Finally, the experimental results were consistent with the simulation results performed using the Monte-Carlo method.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Bing-Cheng Lin ; Jhih-Kai Huang ; Kuo-Ju Chen ; Sheng-Huan Chiu ; Zong-Yi Tu, et al.
"Luminous efficiency enhancement of white light-emitting diodes by using a hybrid phosphor structure", J. Photon. Energy. 5(1), 057603 (Feb 19, 2015). ; http://dx.doi.org/10.1117/1.JPE.5.057603


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