2001 Fiscal Year Final Research Report Summary
A Study of Luminescence Wavelength Control on Room Temperature Luminescent Materials by μm-Region Analysis
| Project/Area Number |
11650695
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Inorganic materials/Physical properties
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| Research Institution | The University of Electro-Communications |
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Principal Investigator |
TANAKA Katsumi The University of Electro-Communications, Faculty of Electro-Communications, Professor, 電気通信学部, 教授 (30155121)
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| Project Period (FY) |
1999 – 2001
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| Keywords | luminescence / pulsed laser deposition (PLD) / rare-earth ion / thin film / tungsten oxide / electron probe micro analysis (EPMA) / photoelectron spectroscopy (XPS) / scintillator |
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| Research Abstract |
Multi-channel photo-detector was purchased to obtain in-situ photo-luminescence ( PL) spectra activated with electron and X-ray. The μm-region cathode-luminescence was applicable in addition to μm-region atomic ratio analysis. Results are (1) Luminescence spectra of Sm, Eu and Gd ion-doped CdWO_4 single crystals were studied in association with XPS analysis. Three PL components were convoluted. The PL component at 2.22 eV was selectively observed in cathode-luminescence on Sm-CdWO_4. The reason is explained such that Sm^<3+> ions are displaced to Cd^<2+> and disturb CdWO_4 lattice to generate [WO_5]^<4-> which is responsible for the PL component. (2) Sm-ion doped CdW0_4 thin films were prepared with pulsed laser deposition using SmsOa, GdO and WOs mixed odide targets. The PL component at 2.22 eV was enhanced in X-ray PL on PLD thin films in spite of no change in X-ray activated PL on single crystals. (3) CaWO_4 thin films were prepared with PLD using CaO and WO_3 mixed oxide targets. On the films μm-region cathode-luminescence spectra were recorded to elucidate film quality. (4) Scientific papers on Si clusters and TiO_2 were published. Luminescence properties oh these materials are under preparation for publication.
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