Onset of the Efficiency Droop in GaInN Quantum Well Light-Emitting Diodes under Photoluminescence and Electroluminescence Excitation
The efficiency of Ga0.87In0.13N/GaN single and multiple quantum well (QW) light-emitting diodes is investigated under photoluminescence (PL) and electroluminescence (EL) excitation. By measuring the laser spot area (knife-edge method) and the absorbance of the GaInN QW (transmittance/reflectance measurements), the PL excitation density can be converted to an equivalent EL excitation density. The EL efficiency droop-onset occurs at an excitation density of 2.08 × 1026 cm–3 s–1 (J = 10 A/cm2), whereas no PL efficiency droop is found for excitation densities as high as 3.11 × 1027 cm–3 s–1 (J = 149 A/cm2). Considering Shockley–Read–Hall, radiative, and Auger recombination and including carrier leakage shows that the EL efficiency droop is consistent with a reduction of injection efficiency.
- Research Organization:
- Energy Frontier Research Centers (EFRC) (United States). EFRC for Solid State Lighting Science (SSLS)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 1370400
- Journal Information:
- ACS Photonics, Journal Name: ACS Photonics Journal Issue: 8 Vol. 2; ISSN 2330-4022
- Publisher:
- American Chemical Society (ACS)
- Country of Publication:
- United States
- Language:
- English
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