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We report a reversal in negative capacitance and voltage modulated lightemission from AlGaInP based multi-quantum well electroluminescent diodes undertemperature variation. Unlike monotonically increasing CW light emission withdecreasing temperature, modulated electroluminescence and negative capacitancefirst increase to a maximum and then decrease while cooling down from roomtemperature. Interdependence of such electronic and optical properties isunderstood as a competition between defect participation in radiativerecombination and field assisted carrier escape from the quantum well regionduring temperature variation. The temperature of maximum light emission mustcoincide with the operating temperature of a device for better efficiency.

applied physics letters

Temperature dependent reversal of voltage modulated light emission and  negative capacitance in AlGaInP based multi quantum well light emitting  devices