| 摘要 |
A method for the determination of thermal parameters of sections of light-emitting diode (LED) structure consists in measurement of dependence of temperature of p-n transition of LED T on time t after switch on of LED structure, measurement of power that is consumed by LED structure Pand determination of experimental values Rof thermal resistance and time constants Tfor each link of the structure, where i – number of link, besides that, one additionally measures the dependence of power P, emitted by LED structure on temperature, with determination of coefficient of power effectiveness of light-emitting diode structure &eegr;(T) = P/Pon temperature and experimental dependence of heat resistance of LED structure on time by formulawhere T– temperature of the p-&eegr; junction at given time instant, T– temperature at initial time instant, those are determined by the dependence T(t), after that one calculates theoretical dependence of thermal resistance of the LED structure R(t) by formulaand through approximation of the dependence R(t) with dependence R(t) the experimental values Rand τis determined. |
