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JINLING Chen
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KIM Chen
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Subject: temperature and current on the LED luminous efficiency
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2009-10-06 |
Pairs of high-power
white LED luminous efficiency of the study found the temperature and
current on the LED luminous efficiency of impact: as the temperature
increased, the potential wells in the radiative recombination
probability, and thus reduced the light-emitting efficiency; current
increases, so that more non-equilibrium carriers through the barrier,
reducing the luminescence efficiency. LED work, the high operating
temperature, or excessive operating current will have a clear light
decline: If the LED chip temperatures in excess of the carrying
temperature, This will enable LED luminous efficiency of rapid
decrease, resulting in a clear light decline, and cause permanent
damage to the LED; if LED operating current than the chip saturation
current, LED luminous efficiency will drop rapidly, and create a
noticeable decline of light . and the LED can be contained in
temperature and saturation current have a certain relationship, a good
cooling device can make more LED operating temperature is relatively
lower, saturation current can be larger, LED also can be relatively
large currents at work.
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