Self-Trapped Exciton Photoluminescence from Polycrystalline K2AgI3 Obtained by Solid-State Reaction Method
DAI Peng1,2, XU Zou-Ming1, WANG Yu-Xia1**
1Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026 2School of Physics and Material Science, Anhui University, Hefei 230039
Self-Trapped Exciton Photoluminescence from Polycrystalline K2AgI3 Obtained by Solid-State Reaction Method
DAI Peng1,2, XU Zou-Ming1, WANG Yu-Xia1**
1Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026 2School of Physics and Material Science, Anhui University, Hefei 230039
摘要Polycrystalline K2AgI3 is synthesized by solid-state reaction at 403 K 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 608 nm at 180 K with large Stokes shift is found. When the temperature rises to about 300 K, an obvious PL blue-shift, PL intensity weakening, and an emission band broadening are observed. It is suggested that the emission at about 608 nm may originate from the recombination of self-trapped excitons.
Abstract：Polycrystalline K2AgI3 is synthesized by solid-state reaction at 403 K 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 608 nm at 180 K with large Stokes shift is found. When the temperature rises to about 300 K, an obvious PL blue-shift, PL intensity weakening, and an emission band broadening are observed. It is suggested that the emission at about 608 nm may originate from the recombination of self-trapped excitons.
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2011, Vol. 28 
