Photoluminescence properties of pyrolytic boron nitride.

Abstract

We report on spectroscopic study of pyrolytichBN (pBN) by means of time- and energy-resolved pho-toluminescence methods. A high purity pBN samples(though low crystallinity) allow complementary informa-tion about excited states involved into the luminescenceprocess. We affirm our recent conclusions about theimpurity-related nature of most of fluorescence bands inmicrocrystalline hBN. In addition, a broad band centred at3.7 eV previously not considered because of its superpo-sition with an intense structured impurity emission isattributed to the radiative recombination of deep DAPs.