Photoluminescence properties of pyrolytic boron nitride
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We report on spectroscopic study of pyrolytic hBN (pBN) by means of time- and energy-resolved photoluminescence methods. A high purity pBN samples (though low crystallinity) allow complementary information about excited states involved into the luminescence process. We affirm our recent conclusions about the impurity-related nature of most of fluorescence bands in microcrystalline hBN. In addition, a broad band centred at 3.7 eV previously not considered because of its superposition with an intense structured impurity emission is attributed to the radiative recombination of deep DAPs.
KeywordsBoron Nitride Radiative Recombination Hexagonal Boron Nitride Time Gate Donor Acceptor Pair
This work has been supported by the IHP-Contract HPRI-CT-1999-00040 of the European Commission. The authors are grateful to G. Stryganyuk for assistance in conducting experiments at SUPERLUMI station and to V. Solozhenko for helpful discussions and the kindly providing pyrolytic boron nitride samples.