The effects of TiO 2 diffuser-loaded encapsulation on corrected color temperature uniformity of remote phosphor white LEDs

Yung Fang Chou, Chi Feng Chen, Shang Ping Ying, Yun Ying Yeh

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

With the development of high-efficiency and high-power LEDs, they have become the most energy-efficient and environmentally friendly artificial light source. Phosphor-converted white LEDs are currently mainstream in the market. The remote phosphor is an effective way to enhance the conversion efficiency and lifetime of phosphor-converted LEDs. For applications of high-quality lighting and LCD backlights, the uniformity of angular correlated color temperature (CCT) is very important. This report explored a remote phosphor white LED with low angular CCT variance and high luminous efficiency by using TiO 2 diffuser-loaded encapsulation. Experimental results revealed that for the TiOc diffuser-loaded encapsulation remote phosphor white LED, the angular color uniformity could be improved by 31.82% and the luminous flux by 8.65%. Moreover, the mean CCTs of the TiO 2 diffuser-loaded encapsulation and non-diffuser remote phosphor white LEDs were similar at a driving current of 350 mA. Finally, we showed that incorporating the TiO 2 diffuser into the phosphor layer of the remote phosphor white LEDs, does not influence the reliability of the LED.

Original languageEnglish
Article number675
JournalApplied Sciences (Switzerland)
Volume9
Issue number4
DOIs
StatePublished - 16 Feb 2019

Keywords

  • Corrected color temperature (CCT)
  • Remote phosphor white LED
  • TiO diffuser

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