Origin of the low-forward leakage current in InGaN-based LEDs

Carlo De Santi; Matteo Buffolo; Nicola Renso; Gaudenzio Meneghesso; Enrico Zanoni; Matteo Meneghini

doi:10.1117/12.2509513

1 March 2019 Origin of the low-forward leakage current in InGaN-based LEDs

Carlo De Santi, Matteo Buffolo, Nicola Renso, Gaudenzio Meneghesso, Enrico Zanoni, Matteo Meneghini

Proceedings Volume 10940, Light-Emitting Devices, Materials, and Applications; 109400J (2019) https://doi.org/10.1117/12.2509513
Event: SPIE OPTO, 2019, San Francisco, California, United States

Abstract

We investigate the electroluminescence of blue LEDs in low bias (500 pA – 9 μA) at different temperature (15°C – 75°C). From 500 pA to 100 nA, the OP increases with bias current up to 10nA, and is stronger at higher temperature, as expected by radiative recombination through deep levels. The stronger contribution is at λ > 800 nm, i.e. at energies lower than the QW and GaN barrier midgap (720 nm). Above 100 nA the OP increases with current, and is compatible with QW emission. Its intensity decreases at higher temperature, as expected for non-radiative recombination. The experimental findings indicate that radiative recombination through deep levels can significantly influence the low current characteristics of the devices, even when those states are not at midgap.

Citation Download Citation

Carlo De Santi, Matteo Buffolo, Nicola Renso, Gaudenzio Meneghesso, Enrico Zanoni, and Matteo Meneghini "Origin of the low-forward leakage current in InGaN-based LEDs", Proc. SPIE 10940, Light-Emitting Devices, Materials, and Applications, 109400J (1 March 2019); https://doi.org/10.1117/12.2509513

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KEYWORDS

Quantum wells

Electroluminescence

Light emitting diodes

Luminescence

Gallium nitride

Blue light emitting diodes

Optoelectronic devices

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