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Journal of Photonics for Energy

Theoretical analysis of blue to white down conversion for light-emitting diode light with yttrium aluminum garnet phosphor
Author(s): Ashok Kumar Lunia; Saroj Kanta Patra; Sandeep Kumar; Sumitra Singh; Suchandan Pal; Chenna Dhanavantri
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Paper 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 ∼10  μm 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 2.10E7  cm −3 and thickness of 30 μm for an injection current density of 10  A/cm 2 . 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.

Paper Details

Date Published: 13 May 2014
PDF: 11 pages
J. Photon. Energy. 4(1) 043596 doi: 10.1117/1.JPE.4.043596
Published in: Journal of Photonics for Energy Volume 4, Issue 1
Show Author Affiliations
Ashok Kumar Lunia, CSIR-Central Electronics Engineering Research Institute (India)
Saroj Kanta Patra, CSIR-Central Electronics Engineering Research Institute (India)
Academy of Scientific and Innovative Research (India)
Sandeep Kumar, CSIR-Central Electronics Engineering Research Institute (India)
Sumitra Singh, CSIR-Central Electronics Engineering Research Institute (India)
Suchandan Pal, CSIR-Central Electronics Engineering Research Institute (India)
Academy of Scientific and Innovative Research (India)
Chenna Dhanavantri, CSIR-Central Electronics Engineering Research Institute (India)
Academy of Scientific and Innovative Research (India)


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