Title :
Temperature behavior and compensation of light-emitting diode
Author :
Bera, S.C. ; Singh, R.V. ; Garg, V.K.
Author_Institution :
Space Applications Centre, Ahmedabad, India
Abstract :
This letter offers a fresh insight into the behavior of light-emitting diode (LED) over temperature. Theoretically and by measurement, it has been shown that equi-intensity curves in the diodes current-voltage plane are nearly a straight line over a very wide range of temperatures. Based on this property, bias voltage and resistance value of a bias circuit have been realized and practical measurement shows the peak-to-peak light intensity variation decreases from 99 % (in case of fixed current bias) to 6 % over the temperature range of -20 C to +80 C for the LED IN6092. This circuit uses no separate temperature sensor or compensating mechanism, but responds directly to the junction temperature of the diodes. This prevents any error caused by temperature gradient, or by self-heating due to power dissipation in the diode.
Keywords :
light emitting diodes; thermo-optical effects; -20 to 80 degC; LED 1N6092; LED compensation; bias circuit; diode junction temperature; equiintensity curves; light-emitting diode; power dissipation; self-heating; temperature behavior; temperature gradient; temperature sensor; Circuits; Current measurement; Electrical resistance measurement; Light emitting diodes; Optical filters; Semiconductor diodes; Temperature dependence; Temperature distribution; Temperature sensors; Voltage; Equiintensity curve; light intensity; light-emitting diode (LED); load line; temperature compensation;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2005.858154
