| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Self-Trapped Exciton Photoluminescence from Polycrystalline K2AgI3 Obtained by Solid-State Reaction Method |
| DAI Peng1,2, XU Zou-Ming1, WANG Yu-Xia1**
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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
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| Cite this article: |
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DAI Peng, XU Zou-Ming, WANG Yu-Xia 2011 Chin. Phys. Lett. 28 017804 |
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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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| Keywords:
78.55.Hx
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Received: 09 June 2010
Published: 23 December 2010
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| PACS: |
78.55.Hx
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(Other solid inorganic materials)
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