Planar lighting system using array of blue leds to excite yellow remote phosphor film

Hsin Tao Huang*, Yi-Pai Huang, Chuang Chuang Tsai

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

48 Scopus citations


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.

Original languageEnglish
Article number5692161
Pages (from-to)44-51
Number of pages8
JournalIEEE/OSA Journal of Display Technology
Issue number1
StatePublished - 28 Jan 2011


  • Angular color deviation
  • indium gallium nitride (InGaN)
  • light-emitting diodes (LEDs)
  • phosphor
  • remote phosphor
  • yttrium aluminum garnet (YAG)

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