Optimization of nanoscale phenomena in AlGaN for improved UV emitters

M. Wraback; G. A. Garrett; A. V. Sampath; H. Shen

doi:10.1117/12.699181

2 February 2007 Optimization of nanoscale phenomena in AlGaN for improved UV emitters

M. Wraback, G. A. Garrett, A. V. Sampath, H. Shen

Proceedings Volume 6479, Quantum Sensing and Nanophotonic Devices IV; 64791H (2007) https://doi.org/10.1117/12.699181
Event: Integrated Optoelectronic Devices 2007, 2007, San Jose, California, United States

Abstract

We have developed AlGaN films deposited by plasma assisted molecular beam epitaxy (PA-MBE) that can possess enhanced internal quantum efficiency (> 30%) due to the presence of nanometer scale compositional inhomogeneities (NCI-AlGaN) within a wider bandgap matrix that inhibit nonradiative recombination through the large defect densities (> 10¹⁰cm^-2) in these materials. Time- and temperature-dependent studies of the UV photoluminescence from these NCI AlGaN films as a function of growth conditions have been performed with the goal of optimizing the emission efficiency. Measurements of radiative and nonradiative lifetimes in conjunction with modeling indicate that the NCI AlGaN inherently combines inhibition of nonradiative recombination with reduction of radiative lifetime, providing a potentially higher efficiency UV emitter active region.

Citation Download Citation

M. Wraback, G. A. Garrett, A. V. Sampath, and H. Shen "Optimization of nanoscale phenomena in AlGaN for improved UV emitters", Proc. SPIE 6479, Quantum Sensing and Nanophotonic Devices IV, 64791H (2 February 2007); https://doi.org/10.1117/12.699181

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