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Title: Temperature dependent reversal of voltage modulated light emission and negative capacitance in AlGaInP based multi quantum well light emitting devices
Authors: Bansal, Kanika
Dept. of Physics
Keywords: Voltage modulation
light emission
Negative capacitance
Quantum well light
Dielectric response
Radiative recombination
Negative capacitance
Issue Date: Feb-2013
Publisher: AIP Publishing
Citation: Applied Physics Letters, 102(5), 53508.
Abstract: We report a reversal in negative capacitance (NC) and voltage modulated light emission from AlGaInP based multi-quantum well (QW) electroluminescent diodes under temperature variation. Unlike monotonically increasing continuous wave light emission with decreasing temperature, modulated electroluminescence and negative capacitance first increase to a maximum and then decrease while cooling down from room temperature. Interdependence of such electronic and optical properties is understood as a competition between defect participation in radiative recombination and field assisted carrier escape from the quantum well region during temperature variation. The temperature of maximum light emission must coincide with the operating temperature of a device for better efficiency.
ISSN: 1077-3118
Appears in Collections:JOURNAL ARTICLES

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