Anti-Stokes photoluminescence in GaN single crystals and heterostructures

Suvranta K. Tripathy; Yujie J. Ding; Jacob B. Khurgin

doi:10.1117/12.807227

9 February 2009 Anti-Stokes photoluminescence in GaN single crystals and heterostructures

Suvranta K. Tripathy, Yujie J. Ding, Jacob B. Khurgin

Proceedings Volume 7228, Laser Refrigeration of Solids II; 722807 (2009) https://doi.org/10.1117/12.807227
Event: SPIE OPTO: Integrated Optoelectronic Devices, 2009, San Jose, California, United States

Abstract

We review some of our recent results following the investigation of anti-Stokes photoluminescence (PL). Indeed, we have observed anti-Stokes photoluminescence from n-type free-standing GaN at room temperature. Such a process is induced by phonon-assisted absorption. When the excitation photon energy is sufficiently below the donor-acceptor transition energy, however, two-photon absorption becomes the dominant mechanism for anti-Stokes photoluminescence. By measuring the dependences of the photoluminescence spectra on temperature, excitation power, and excitation photon energy, we have demonstrated that donor-acceptor pair transition plays an important role in the generation of anti-Stokes photoluminescence. Our study could result in efficient laser cooling of semiconductors.

Citation Download Citation

Suvranta K. Tripathy, Yujie J. Ding, and Jacob B. Khurgin "Anti-Stokes photoluminescence in GaN single crystals and heterostructures", Proc. SPIE 7228, Laser Refrigeration of Solids II, 722807 (9 February 2009); https://doi.org/10.1117/12.807227

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