Quantum-transfer-efficiency excitation spectroscopy: Application to direct observation of yellow luminescent level of GaN

Tianshu Lai; Jinhui Wen; Weizhu Lin
January 2005
Applied Physics Letters;1/24/2005, Vol. 86 Issue 4, p041102
Academic Journal
A quantum-transfer-efficiency excitation spectroscopy (QTEES) is developed. It measures the quantum transfer efficiency from the photoexcited level to the initial level of the luminescence measured. It is self-normalized and based on the relative measurement of photoluminescence intensity. The initial level of the luminescence detected corresponds to the position of the strongest excitation peak in a QTEES spectrum. An experiment of QTEES on an undoped GaN film is carried out, and the initial level of the yellow luminescence is obtained directly from the QTEES spectrum. The initial level measured is very close to the bottom of the conduction band, which provides direct evidence to support shallow donor–deep acceptor recombination of the yellow luminescence in the GaN film. QTEES spectra have the advantages of easy explanation and clear physical meanings. It is also found that the conventional photoluminescence excitation spectra need to be corrected by a factor of the energy of the excitation photon.


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