Spectral Optimization of Candle-Like White Light-Emitting Diodes With High Color Rendering Index and Luminous Efficacy

The tradeoff between the color rendering index (CRI) and the luminous efficacy (LE) for candle-like three-hump white light-emitting diodes (LEDs), which consist of blue InGaN chip, yellow aluminate phosphors, and red AlGaInP chip, has been investigated. Spectral models have been separately developed...

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Bibliographic Details
Published in:Journal of display technology 2016-11, Vol.12 (11), p.1393-1397
Main Authors: Guo, Ziquan, Lu, Hongli, Shih, Tienmo, Lin, Yue, Lu, Yijun, Chen, Zhong
Format: Article
Language:English
Subjects:
Color
color rendering index
Correlated color temperature
Image color analysis
Indexes
Light emitting diodes
light-emitting diode
luminous efficacy
Optimization
Phosphors
Rendering (computer graphics)
Stokes loss
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Summary:The tradeoff between the color rendering index (CRI) and the luminous efficacy (LE) for candle-like three-hump white light-emitting diodes (LEDs), which consist of blue InGaN chip, yellow aluminate phosphors, and red AlGaInP chip, has been investigated. Spectral models have been separately developed for the optimization process after experimentally measuring spectral power distributions of phosphor materials and semiconductor chips. By filtering billions of defective spectral data with a nonlinear program, optimal values of LE of 272 lm/W and CRI of 96 (CRI No.9 of 98) at a correlated color temperature of 2000 K can be achieved, while LE and CRI are 0.1 lm/W and 83 for candles. These three-humps LEDs are capable of achieving excellent photometric and chromatic performances of candle-like white light. Finally, this study can serve as a critical guide for manufacturing high-CRI candle-like white LEDs.
ISSN:1551-319X
1558-9323
DOI:10.1109/JDT.2016.2598861