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8 March 2016 AlGaInP red-emitting light emitting diode under extremely high pulsed pumping
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Efficiency of commercial 620 nm AlGaInP Golden Dragon-cased high-power LEDs has been studied under extremely high pump current density up to 4.5 kA/cm2 and pulse duration from microsecond down to sub-nanosecond range. To understand the nature of LED efficiency decrease with current, pulse width variation is used. Analysis of the pulse-duration dependence of the LED efficiency and emission spectrum suggests the active region overheating to be the major factor controlling the LED efficiency reduction at CW and sub-microsecond pumping. The overheating can be effectively avoided by the use of sub-nanosecond current pulses. A direct correlation between the onset of the efficiency decrease and LED overheating is demonstrated.
© (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Amit Yadav, Ilya E. Titkov, Grigorii S. Sokolovskii, Sergey Yu. Karpov, Vladislav V. Dudelev, Ksenya K. Soboleva, Martin Strassburg, Ines Pietzonka, Hans-Juergen Lugauer, and Edik U. Rafailov "AlGaInP red-emitting light emitting diode under extremely high pulsed pumping", Proc. SPIE 9768, Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XX, 97681K (8 March 2016);

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