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A White Light Source Excited by Laser Diodes
Author(s) -
MASUI SHINGO,
YAMAMOTO TOMOYA,
NAGAHAMA SHINICHI
Publication year - 2015
Publication title -
electronics and communications in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.131
H-Index - 13
eISSN - 1942-9541
pISSN - 1942-9533
DOI - 10.1002/ecj.11671
Subject(s) - laser , phosphor , optics , luminance , optoelectronics , luminous flux , blue laser , materials science , diode , blue light , white light , laser diode , light emitting diode , semiconductor laser theory , light source , physics
SUMMARY We developed a compact, high luminance white light source based on nitride semiconductor blue laser diodes (LDs) with yellow phosphor materials. The blue laser light from the LD is focused on the yellow phosphor by an optical lens. As a result, white light is obtained by the mixing of blue laser light and yellow light from the phosphors excited by blue laser light. The luminous flux and the luminance were 250 lm and 270 cd/mm 2 at an operating current of 1.2 A. This high luminance is 2.5 times that of a conventional HID light.