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Planar Lighting System Using Array of Blue LEDs to Excite Yellow Remote Phosphor Film

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3 Author(s)
Hsin-Tao Huang ; Dept. of Photonics, Nat. Chiao Tung Univ., Hsinchu, Taiwan ; Yi-Pai Huang ; Chuang-Chuang Tsai

This investigation demonstrates a novel light-emitting system with an array of blue light-emitting diodes (LEDs). Unlike a conventional lighting system that is constructed from white LEDs, the proposed planar lighting system uses blue LEDs to excite a YAG : Ce3+ yellow phosphor film remotely, yielding a high lumen efficiency with uniform and planar light-emission. The phosphor film herein acts as a wavelength converter and a light diffuser simultaneously. The optical properties of the proposed lighting system, angular color deviation and light-emitting uniformity, are studied. Eventually, a high lumen efficiency (73.0 lm/W) and thin lighting module (7.5 mm-thick) was demonstrated without the use of any conventional diffuser plate or light guiding plate (LGP). A low color deviation (Δu'v' = 0.025) and a high light-emitting uniformity (Uniformity = 82%) were achieved. Hence, the proposed lighting system exhibited superior optical performance using a compact module.

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Display Technology, Journal of  (Volume:7 ,  Issue: 1 )