Abstract
The energy spectrum of manganese luminescence centres in AlN was studied by means of excitation and emission spectra. Two regions of excitation were found: in the first region (from 40 000 to 31 000 cm−1) excitation occurs as a result of transfer of energy from other impurity centres to the manganese centres; in the second region (from 26 000 to 17 000 cm−1) the manganese centres are excited directly. In the excitation band with a peak at about 19 200 cm−1 a phonon structure was observed having a temperature dependence analogous to that of the phonon structure of the emission band. The phonon energy at excitation differs from that at emission (εexc≈260 cm−1, εem≈160 cm−1). A scheme of electron-phonon levels of manganese centres in AlN is presented, and problems relating to the structure of these centres are discussed.
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Na Slovance 2, Praha 8, Czechoslovakia.
The authors would like to thank Dr. L. Kratina and Dr. F. Kubec (Institute of Radio Engineering and Electronics, Czechoslovak Academy of Sciences), who kindly performed the EPR measurements, and to Professor M. Trlifaj and Dr. J. Pastrňák for valuable discussions.
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Karel, F., Mareš, J. Electron states of manganese luminescence centres in A1N. Czech J Phys 22, 847–853 (1972). https://doi.org/10.1007/BF01694863
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DOI: https://doi.org/10.1007/BF01694863