Ca(Eu_<1-x>La_x)_4Si_3O_<13> Red Phosphor and its Application to Tri-Chromatic White LEDs

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概要

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• To facilitate the application of tri-chromatic white LEDs, we developed a Ca(Eu_<1-x>La_x)_4Si_3O_<13> red phosphor that emits red light at a peak wavelength of 613 nm when it is excited by near-ultraviolet rays at a peak wavelength of 395 nm. The activator concentration dependence of the light conversion efficiency showed that the optimum composition of the red phosphor was at x=0.5 and that the conversion efficiency was 0.14. When a near-ultraviolet LED with an assumed external quantum efficiency of 0.40 was combined with Ca(Eu_<0.5>La_<0.5>)_4Si_3O_<13> red phosphor and existing green and blue phosphors, the calculated luminous efficacy and general color rendering index of the resultant white LED were 21.6 lm/W and 83.9, respectively.

• 社団法人照明学会の論文

著者

• Ohta Masato

  Shibaura Institute Of Technology

• Taguchi Tsunemasa

  Yamaguchi Univ.

• YAMADA Kenichi

  Matsushita Electric Works, Ltd.

• Yamada Kenichi

  Matsushita Electric Works Ltd.

関連論文

• High Output Power Near-Ultraviolet and Violet Light-Emitting Diodes Fabricated on Patterned Sapphire Substrates Using Metalorganic Vapor Phase Epitaxy(LED Lighting Technologies)
• Ca(Eu_La_x)_4Si_3O_ Red Phosphor and its Application to Tri-Chromatic White LEDs
• High Output Power InGaN Ultraviolet Light-Emitting Diodes Fabricated on Patterned Substrates Using Metalorganic Vapor Phase Epitaxy

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