Four-wavelengths-mixed white light emitting diodes with dual-wavelength-pumped green and red phosphors

Wei Chih Lai, Jinn Kong Sheu, Yi Keng Fu, Cheng Huang Kuo, Chi Wen Kuo, Ching Ju Tun, Ching Jen Pan, Gou Chung Chi

Research output: Contribution to journalArticle

Abstract

The wavelengths of dual-wavelength light-emitting diodes (LEDs) are near ultraviolet (UV) at approximately 409 and 459 nm for blue when driven at 20 mA. The near-UV emission intensity of LEDs is stronger than the blue emission intensity with a 20 mA driven current. The green and red emission intensities of the phosphor are almost the same as, but less than, the blue emission intensity of the dual-wavelength LED with a 20mA driven current. The CIE color coordinates are x = 0.32 and y = 0.35, while the dual-wavelength LED with a green and red phosphor LED lamp is driven at 20mA.

Original languageEnglish
Pages (from-to)6317-6319
Number of pages3
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume47
Issue number8 PART 1
DOIs
Publication statusPublished - 2008 Aug 8

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

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