Ho-SiAlON Ceramics as Green Phosphors under Ultra-Violet Excitations
In most inorganic phosphors, increasing the concentration of activators inevitably causes the concentration quenching effect, resulting in reduced emission intensity at a high level of activator doping and the conventional practice is to limit the activator concentration to avoid the quenching. In c...
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MDPI AG
2022-09-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/15/19/6715 |
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| author | Yuwaraj K. Kshetri Bina Chaudhary Dhani Ram Dhakal Soo Wohn Lee Tae-Ho Kim |
| author_facet | Yuwaraj K. Kshetri Bina Chaudhary Dhani Ram Dhakal Soo Wohn Lee Tae-Ho Kim |
| author_sort | Yuwaraj K. Kshetri |
| collection | DOAJ |
| description | In most inorganic phosphors, increasing the concentration of activators inevitably causes the concentration quenching effect, resulting in reduced emission intensity at a high level of activator doping and the conventional practice is to limit the activator concentration to avoid the quenching. In contrast, SiAlON ceramics preserve their chemical composition over a very wide range of doping of activator ions, which favors the adjustment and optimization of the luminescence properties avoiding concentration quenching. Here, we investigate the photoluminescence properties of Ho-doped SiAlON (Ho-SiAlON) ceramics phosphors prepared by the hot-press method. Ho-SiAlON ceramics show strong green visible (554 nm) as well as infrared (2046 nm) broadband downshifting emissions under 348 nm excitation. It is shown that there is no concentration quenching, even at a very high level of Ho doping. The emission intensity of the 554 nm band increased two-fold when the Ho concentration is doubled. The results show that the Ho-SiAlON ceramics can be useful for efficient green phosphors. |
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| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T21:31:04Z |
| publishDate | 2022-09-01 |
| publisher | MDPI AG |
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| spelling | doaj.art-04b2cc32f0464d4ea4fe508c3aa571ca2023-11-23T20:55:35ZengMDPI AGMaterials1996-19442022-09-011519671510.3390/ma15196715Ho-SiAlON Ceramics as Green Phosphors under Ultra-Violet ExcitationsYuwaraj K. Kshetri0Bina Chaudhary1Dhani Ram Dhakal2Soo Wohn Lee3Tae-Ho Kim4Research Center for Green Advanced Materials, Sun Moon University, Chungnam 31460, KoreaDepartment of Fusion Science and Technology, Sun Moon University, Chungnam 31460, KoreaResearch Center for Green Advanced Materials, Sun Moon University, Chungnam 31460, KoreaDepartment of Environment and Bio-Chemical Engineering, Sun Moon University, Chungnam 31460, KoreaResearch Center for Green Advanced Materials, Sun Moon University, Chungnam 31460, KoreaIn most inorganic phosphors, increasing the concentration of activators inevitably causes the concentration quenching effect, resulting in reduced emission intensity at a high level of activator doping and the conventional practice is to limit the activator concentration to avoid the quenching. In contrast, SiAlON ceramics preserve their chemical composition over a very wide range of doping of activator ions, which favors the adjustment and optimization of the luminescence properties avoiding concentration quenching. Here, we investigate the photoluminescence properties of Ho-doped SiAlON (Ho-SiAlON) ceramics phosphors prepared by the hot-press method. Ho-SiAlON ceramics show strong green visible (554 nm) as well as infrared (2046 nm) broadband downshifting emissions under 348 nm excitation. It is shown that there is no concentration quenching, even at a very high level of Ho doping. The emission intensity of the 554 nm band increased two-fold when the Ho concentration is doubled. The results show that the Ho-SiAlON ceramics can be useful for efficient green phosphors.https://www.mdpi.com/1996-1944/15/19/6715SiAlON ceramicsdownshifting luminescencephosphorsconcentration quenching |
| spellingShingle | Yuwaraj K. Kshetri Bina Chaudhary Dhani Ram Dhakal Soo Wohn Lee Tae-Ho Kim Ho-SiAlON Ceramics as Green Phosphors under Ultra-Violet Excitations Materials SiAlON ceramics downshifting luminescence phosphors concentration quenching |
| title | Ho-SiAlON Ceramics as Green Phosphors under Ultra-Violet Excitations |
| title_full | Ho-SiAlON Ceramics as Green Phosphors under Ultra-Violet Excitations |
| title_fullStr | Ho-SiAlON Ceramics as Green Phosphors under Ultra-Violet Excitations |
| title_full_unstemmed | Ho-SiAlON Ceramics as Green Phosphors under Ultra-Violet Excitations |
| title_short | Ho-SiAlON Ceramics as Green Phosphors under Ultra-Violet Excitations |
| title_sort | ho sialon ceramics as green phosphors under ultra violet excitations |
| topic | SiAlON ceramics downshifting luminescence phosphors concentration quenching |
| url | https://www.mdpi.com/1996-1944/15/19/6715 |
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