DEGRADATION OF WHITE AND BLUE LEDS AT PROLONGED OPERATION TIME
Saint Petersburg National Research University of Information Technologies, Mechanics and Optics; Ioffe Physical-Technical Institute of the Russian Academy of Sciences; leading engineer; postgraduate
V. E. Bougrov
ITMO University, Saint Petersburg, 197101, Russian Federation; Professor
A. R. Kovsh
CJSC Optogan, St. Petersburg; ITMO University, Department of Light Diode Technologies; Professor, Executive Vice-President
M. A. Odnoblyudov
CJSC Optogan, St. Petersburg; St. Petersburg National Research University of Information Technologies, Mechanics and Optics, Department of Light Diode Technologies; General Manager, Professor
V. I. Nikolaev
ITMO University, Ioffe Institute RAS; Associate professor, Senior scientific researcher
A. E. Romanov
ITMO University, Saint Petersburg, 197101, Russian Federation; Full Professor
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Abstract. Time dependences of forward voltage drop in blue and white LEDs operating at 20, 25, and 30 mA during 21,000 hours are investigated. White LEDs based on a silicate phosphor with CCT of 4500 K is shown to enhanced degradation.
Keywords:
blue LED, white LED, phosphor, degradation
