Light-Emitting Materials, Devices, and Technologies

Theoretical analysis of blue to white down conversion for light-emitting diode light with yttrium aluminum garnet phosphor

[+] Author Affiliations
Ashok Kumar Lunia

CSIR-Network of Institutes for Solar Energy, CSIR-Central Electronics Engineering Research Institute (CSIR-CEERI), Pilani, Rajasthan 333031, India

Saroj Kanta Patra

CSIR-Network of Institutes for Solar Energy, CSIR-Central Electronics Engineering Research Institute (CSIR-CEERI), Pilani, Rajasthan 333031, India

Academy of Scientific and Innovative Research, Advanced Semiconductor Electronics Branch, New Delhi 110001, India

Sandeep Kumar

CSIR-Network of Institutes for Solar Energy, CSIR-Central Electronics Engineering Research Institute (CSIR-CEERI), Pilani, Rajasthan 333031, India

Sumitra Singh

CSIR-Network of Institutes for Solar Energy, CSIR-Central Electronics Engineering Research Institute (CSIR-CEERI), Pilani, Rajasthan 333031, India

Suchandan Pal

CSIR-Network of Institutes for Solar Energy, CSIR-Central Electronics Engineering Research Institute (CSIR-CEERI), Pilani, Rajasthan 333031, India

Academy of Scientific and Innovative Research, Advanced Semiconductor Electronics Branch, New Delhi 110001, India

Chenna Dhanavantri

CSIR-Network of Institutes for Solar Energy, CSIR-Central Electronics Engineering Research Institute (CSIR-CEERI), Pilani, Rajasthan 333031, India

Academy of Scientific and Innovative Research, Advanced Semiconductor Electronics Branch, New Delhi 110001, India

J. Photon. Energy. 4(1), 043596 (May 13, 2014). doi:10.1117/1.JPE.4.043596
History: Received February 6, 2014; Revised April 22, 2014; Accepted April 23, 2014
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Abstract.  The down conversion of blue to white light with yttrium aluminum garnet (YAG) phosphor is analyzed theoretically for GaN/InGaN light emitting diodes. A cerium-doped YAG phosphor with particle size of 10μm having peak emission wavelength of 560 nm is considered in this study. Effects of phosphor concentration, thickness of the conversion medium, excitation spectrum, and driving current are studied in terms of luminous efficacy and the quality of white light emission. It has been observed that the above parameters have a significant effect on chromaticity coordinates. Ray-tracing simulation results show that the luminous efficacy of down-converted white light is found to be 3.25 times the blue light excitation with phosphor concentration of 2.10E7cm3 and thickness of 30 μm for an injection current density of 10A/cm2. A stable cool white light having correlated color temperature in a range of 5500–5600 K is achieved for the proposed optimized design for the variation of ambient temperatures from 25°C to 150°C.

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© 2014 Society of Photo-Optical Instrumentation Engineers

Citation

Ashok Kumar Lunia ; Saroj Kanta Patra ; Sandeep Kumar ; Sumitra Singh ; Suchandan Pal, et al.
"Theoretical analysis of blue to white down conversion for light-emitting diode light with yttrium aluminum garnet phosphor", J. Photon. Energy. 4(1), 043596 (May 13, 2014). ; http://dx.doi.org/10.1117/1.JPE.4.043596


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