Effects of Phosphor Application Geometry on White Light-Emitting Diodes

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概要

• 論文の詳細を見る

• We fabricated white light-emitting diode lamps with three types of commercial yellow-emitting phosphors and studied the effects of phosphor application geometry. Two advantages were confirmed when low-concentration phosphor/silicone mixtures were employed: a 20% increase in output luminous flux and a reduced shift in the chromaticity coordinates upon change in diode current. We propose a simple model to describe these experimental results. According to the model, the results were attributed to reduced phosphor self-absorption (in the yellow spectral range) and reduced absorption saturation (in the blue spectral range), respectively, of the low-concentration mixture. The mathematical expression of the model will be effective for designing white light-emitting diodes based on the phosphor down-conversion technique.

• Japan Society of Applied Physicsの論文
• 2006-09-25

著者

• DENBAARS Steven

  Materials Department and Electrical Engineering Department, University of California

• Masui Hisashi

  Materials Department College Of Engineering University Of California

• Nakamura Shuji

  Materials Department University Of Cahfornia

• DenBaars Steven

  Materials Department and Electrical and Computer Engineering Department, University of California, Santa Barbara, CA 93106, U.S.A.

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