Resolving decay-time dependent photoluminescence induced by phonon-dressed excitons in ZnO

Ryu Yukawa, Susumu Yamamoto, Ren Arita, Yuki Minami, Kohei Yamanoi, Kenichi Ozawa, Kazuyuki Sakamoto, Toshihiko Shimizu, Nobuhiko Sarukura, Iwao Matsuda

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Time-resolved photoluminescence (PL) experiments on ZnO crystals have been conducted at room temperature to elucidate the origins of a near-band edge (NBE) emission. A temporal profile of the PL spectra exhibits a two-curve structure with different decaying rates and is reproduced reasonably by a biexponential function, indicating that there are at least two origins with different decay times in the NBE emission. By taking free exciton (FX)-longitudinal optical (LO) phonon interactions into account in the analysis of the PL spectra, the faster and slower decaying emissions are found to be associated with stronger and weaker FX-LO phonon coupling, respectively. We propose that the NBE emissions with different decay times are related to crystal imperfections; the fast-decaying emission originates from the region with a higher density of defects or impurities, while the slower one is from the regions with better crystallinity.

Original languageEnglish
Article number104607
JournalPhysical Review Materials
Issue number10
Publication statusPublished - 2022 Oct


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