OPTOPHYSICLA MEASUREMENTS CHANGES IN EMISSION CHARACTERISTICS OF LIGHT-EMITTING DIODES UNDER VARIATION OF INTERNAL FACTORS AND PULSE-EXCITATION PARAMETERS

摘要

A relationship is established between the wavelength λ at the maximum of the near-edge emission band of a light-emitting diode (LED) and the external parameters of the puss current t_i and Q and the thermal time constant τ_i, which is determined by the product of the thermal resistance and capacitance. A dependence of the shift in λ on the relationship between the LED's internal and external parameters is discovered. It is shown that for LED operation in the pulsed mode, the shift in λ with variation of t_i. Q, and especially τ_i can reach values on the order of 10 nm (or more), which is a considerable source of errors.