A novel randomly textured phosphor structure for highly efficient white light-emitting diodes

Hsin Chu Chen, Kuo Ju Chen, Chao Hsun Wang, Chien-Chung Lin, Chia Chi Yeh, Hsin Han Tsai, Min Hsiung Shih, Hao-Chung Kuo, Tien-Chang Lu

Research output: Contribution to journalArticlepeer-review

37 Scopus citations

Abstract

We have successfully demonstrated the enhanced luminous flux and lumen efficiency in white light-emitting diodes by the randomly textured phosphor structure. The textured phosphor structure was fabricated by a simple imprinting technique, which does not need an expensive dry-etching machine or a complex patterned definition. The textured phosphor structure increases luminous flux by 5.4% and 2.5% at a driving current of 120 mA, compared with the flat phosphor and half-spherical lens structures, respectively. The increment was due to the scattering of textured surface and also the phosphor particles, leading to the enhancement of utilization efficiency of blue light. Furthermore, the textured phosphor structure has a larger view angle at the full width at half maximum (87°) than the reference LEDs.

Original languageEnglish
Article number188
Pages (from-to)1-5
Number of pages5
JournalNanoscale Research Letters
Volume7
Issue number1
DOIs
StatePublished - 16 Mar 2012

Keywords

  • Imprinting
  • Package
  • Phosphor
  • Texture
  • White light-emitting diodes

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