Photoluminescence and structural characteristics of double tungstates A(M1?X PrX)W2O8 (A = Li,Cs, M = Al,Sc, La) |
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| Authors: | Kyoung Ho Lee Ki-Woong Chae Chae Il Cheon Jeong Seog Kim |
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| Affiliation: | 1. Dept. of BK21 Semiconductor & Display Engineering, Hoseo University, Baebang, Asan, Chungnam, 336-795, Republic of Korea;2. Dept. of Materials Science and Engineering, Hoseo University, Baebang, Asan, Chungnam, 336-795, Republic of Korea;1. Department of Metallurgical and Materials Engineering, Marmara University, Göztepe Campus, 34722 Kadiköy, ?stanbul, Turkey;2. Department of Metallurgical and Materials Engineering, Y?ld?z Technical University, 34220 Davutpa?a-?stanbul, Turkey;1. Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education, School of Chemistry and Environment, South China Normal University, Guangzhou 510006, PR China;2. School of Chemistry and Environment, South China Normal University, Guangzhou 510006, PR China;3. Guangzhou Key Laboratory of Materials for Energy Conversion and Storage, Guangzhou 510006, PR China;4. Institute for Advanced Materials, Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, PR China;1. Department of Electrical and Electronics Engineering, Atilim University, 06836 Ankara, Turkey;2. Department of Physics, Middle East Technical University, 06800 Ankara, Turkey;1. Department of Physic, Faculty of Science, Manisa Celal Bayar University, 45030 Manisa, Turkey;2. Department of Metallurgical and Materials Engineering, Dokuz Eylul University, ?zmir, Turkey;3. Experimental Science Applications and Research Center, Manisa Celal Bayar University, 45030 Manisa, Turkey;4. Department of Physics, Faculty of Engineering and Natural Sciences, Bursa Technical University, Bursa, Turkey;5. Department of Chemistry, Faculty of Science, Manisa Celal Bayar University, 45030 Manisa, Turkey |
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| Abstract: | In this article, photoluminescence of Pr3+ ions in the double tungstate A(M1?X PrX)W2O8 (A = Li, Cs, M = Al, Sc, La; 0.0 ≤ X ≤ 0.1) are characterised. By varying ion radius in A and M sites the crystal structure was modified and even in crystals with similar structural characteristics three distinctive types of luminescence are observed. When the substitution ions in both A and M sites are relatively small the host lattice exhibits luminescence dominantly. With the small A site ion (Li+) and the large M site ion (La3+, 1.03 Å) the Pr3+ ion exhibits prominent luminescence. With the very large A site ion (Cs+, 1.67 Å) and relatively small M site ion (Sc3+, 0.75 Å) the Pr3+ exhibits both the 4f2–4f5d excitation and the 3PJ manifold excitations in the absorption spectrum. These excitation levels lead to two strong emissions from the Pr3+. PL characteristics are discussed with respect to crystal structural criteria. |
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