physica status solidi (a) · 2007 · 15 citations · 5 references
EngineeringElectrical EngineeringMaterials ScienceOptical MaterialsOptoelectronicsPhotonicsLight SourcesLight-emitting DiodesLuminescent MaterialsCharge Carrier DensityLed LightingLight-emitting DevicesLight-emitting Diode MaterialsPhotoinduced LuminescencePhotoluminescenceQuantum EfficiencyUltraviolet Light-emitting Diodes
Abstract A series of (AlGaIn)N LEDs covering the 377 to 428 nm wavelength interval has been analyzed by pulsed electro‐ and temperature dependent photo‐luminescence with respect to the carrier density dependence of the quantum efficiency and peak position. A non‐thermal rollover of the quantum efficiency vs. current is observed for the LEDs with higher In content and longer wavelengths ( λ > 400 nm). The photoluminescence data reveal In induced band tails as well as the presence of a quantum confined stark effect. Both effects contribute to the observed non‐thermal rollover. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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