Author： Peng Dai Zou-Ming Xu Yu-Xia Wang
Publisher： IOP Publishing
ISSN： 0256-307X
Source： Chinese Physics Letters, Vol.28, Iss.1, 2011-01, pp. : 17804-17807
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Abstract
Polycrystalline K2AgI3 is synthesized by solid-state reaction at 403K using AgI and KI as starting materials. X-ray diffraction, photoluminescence (PL) spectra, photoluminescence excitation (PLE) spectra, electron paramagnetic resonance (EPR) and absorption spectra are employed to investigate the structure and photo-physical properties of such material. A broad luminescence band centered at about 608nm at 180K with large Stokes shift is found. When the temperature rises to about 300K, an obvious PL blue-shift, PL intersity weakening, and an emission band broadening are observed. It is suggested that the emission at about 608nm may originate from the recombination of self-trapped excitons.
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