Enhanced Luminous efficiency of WLEDs using a dual-layer structure of the remote phosphor package

Kuo Ju Chen, Hsin Chu Chen, Min Hsiung Shih, Chao Hsun Wang, Hsin Han Tsai, Shih Hsuan Chien, Chien-Chung Lin, Hao-Chung Kuo

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

This study demonstrates how the insertion of a thin silicone layer into a dual-layer remote phosphor structure enhances light extraction in white light-emitting diodes (WLEDs). In the experiment, a dual-layer phosphor structure yielded a higher intensity of blue and yellow components than a conventional structure. Moreover, the lumen flux was 5% higher than a conventional remote phosphor package at the same correlated color temperature (CCT). Using a TFCalc32 simulation, the electric field intensity was calculated for different thicknesses of the dual-layer remote phosphor structures, and the enhanced use of blue rays was verified. Additionally, the dual-layer structure reduces chromaticity deviations as the driving current increases.

Original languageEnglish
Article number6513271
Pages (from-to)1941-1945
Number of pages5
JournalJournal of Lightwave Technology
Volume31
Issue number12
DOIs
StatePublished - 3 Jun 2013

Keywords

  • Coatings
  • GaN
  • light-emitting diodes
  • optoelectronic devices
  • packaging
  • phosphor

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