Abstract
By comparing experimental and theoretical radiative recombination spectra, we have determined the values of the square of the matrix element for interband optical transitions |M|2 in epitaxial GaN at different temperatures T. The data obtained were used to analyze the mechanism for the temperature dependence of the lasing threshold for a GaN laser. In the experiments, we used epitaxial layers of GaN with a wurtzite crystal structure, grown on Al2O3 (0001) substrates and excited by a focused beam from a nitrogen laser. We have shown that the spontaneous emission spectra near the lasing threshold of a GaN laser are consistent with the model of optical interband transitions not obeying a selection rule for the electron wave vector. As we have established, the parameter |M|2 practically does not vary for T = 300–470 K: 5.4·10−73 kg2·m5/sec2. Further increase in the temperature leads to an exponential fall-off in |M|2 down to 3.4·10−73 kg2·m5/sec2 at T ≈ 520 K. Such behavior of |M|2 as a function of temperature correlates with the sudden increase in the nonradiative recombination rate at T > 470 K, and may be connected with a change in the recombination mechanisms in the active layer of the GaN laser in the high temperature region.
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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 74, No. 6, pp. 790–794, November–December, 2007.
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Burov, L.I., Lebedok, E.V., Kononenko, V.K. et al. Interband transition matrix element and temperature dependence of the lasing threshold for GaN laser structures. J Appl Spectrosc 74, 878–883 (2007). https://doi.org/10.1007/s10812-007-0136-2
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DOI: https://doi.org/10.1007/s10812-007-0136-2