Tunable dual-mode emission with excellent thermal stability in Ca₄ZrGe₃O₁₂ : Eu phosphors prepared in air for NUV-LEDs
Novel dual valence Eu-doped Ca₄ZrGe₃O₁₂ (CZGO) phosphors were successfully fabricated in air atmosphere through a solid-state route. Their crystal structure, photoluminescence properties as well as thermal quenching performance were investigated systematically. The spectra show that part of Eu³⁺ wer...
| Main Authors: | , , , , , , , |
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| Format: | Journal Article |
| Language: | English |
| Published: |
2021
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| Online Access: | https://hdl.handle.net/10356/151874 |
| _version_ | 1826122133345927168 |
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| author | Wei, Rongfei Li, Kunjiao Feng, Jingjing Tian, Xiangling Shi, Yafei Li, Xiaoman Hu, Fangfang Guo, Hai |
| author2 | School of Physical and Mathematical Sciences |
| author_facet | School of Physical and Mathematical Sciences Wei, Rongfei Li, Kunjiao Feng, Jingjing Tian, Xiangling Shi, Yafei Li, Xiaoman Hu, Fangfang Guo, Hai |
| author_sort | Wei, Rongfei |
| collection | NTU |
| description | Novel dual valence Eu-doped Ca₄ZrGe₃O₁₂ (CZGO) phosphors were successfully fabricated in air atmosphere through a solid-state route. Their crystal structure, photoluminescence properties as well as thermal quenching performance were investigated systematically. The spectra show that part of Eu³⁺ were reduced to Eu²⁺ and the mechanism is interpreted by the charge compensation. By altering Eu concentration, multi-color luminescence covering from blue to red is realized when irradiated by 370 nm light, which perfectly matches with the near ultraviolet (NUV) light-emitting diode (LED) chips. More importantly, under NUV excitation, luminescent intensities are almost unchanged even up to 423 K. And chromaticity exhibits only a tiny shift with growing temperature. Such suitable luminescent spectra and superior thermal stability indicate that CZGO:Eu phosphors are promising candidates for blue-red components in NUV pumped W-LEDs. Finally, the fabricated W-LED based on the combination of CZGO:Eu phosphors, Ba₂SiO₄:Eu²⁺ and a 365 nm NUV-LED chip gives a high color rendering index, a low correlated color temperature and suitable CIE chromaticity coordinates. |
| first_indexed | 2024-10-01T05:43:30Z |
| format | Journal Article |
| id | ntu-10356/151874 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T05:43:30Z |
| publishDate | 2021 |
| record_format | dspace |
| spelling | ntu-10356/1518742021-07-26T02:06:44Z Tunable dual-mode emission with excellent thermal stability in Ca₄ZrGe₃O₁₂ : Eu phosphors prepared in air for NUV-LEDs Wei, Rongfei Li, Kunjiao Feng, Jingjing Tian, Xiangling Shi, Yafei Li, Xiaoman Hu, Fangfang Guo, Hai School of Physical and Mathematical Sciences Science::Physics Light-emitting Diode Optical Materials/Properties Novel dual valence Eu-doped Ca₄ZrGe₃O₁₂ (CZGO) phosphors were successfully fabricated in air atmosphere through a solid-state route. Their crystal structure, photoluminescence properties as well as thermal quenching performance were investigated systematically. The spectra show that part of Eu³⁺ were reduced to Eu²⁺ and the mechanism is interpreted by the charge compensation. By altering Eu concentration, multi-color luminescence covering from blue to red is realized when irradiated by 370 nm light, which perfectly matches with the near ultraviolet (NUV) light-emitting diode (LED) chips. More importantly, under NUV excitation, luminescent intensities are almost unchanged even up to 423 K. And chromaticity exhibits only a tiny shift with growing temperature. Such suitable luminescent spectra and superior thermal stability indicate that CZGO:Eu phosphors are promising candidates for blue-red components in NUV pumped W-LEDs. Finally, the fabricated W-LED based on the combination of CZGO:Eu phosphors, Ba₂SiO₄:Eu²⁺ and a 365 nm NUV-LED chip gives a high color rendering index, a low correlated color temperature and suitable CIE chromaticity coordinates. This work was financially supported by the National Natural Science Foundation of China (Grant No. 51802285, 11974315, 11804303), the Natural Science Foundation of Zhejiang Province (Grant No. LQ18A040004), the Open Fund of the State Key Laboratory of Luminescent Materials and Devices (South China University of Technology). 2021-07-26T02:06:44Z 2021-07-26T02:06:44Z 2019 Journal Article Wei, R., Li, K., Feng, J., Tian, X., Shi, Y., Li, X., Hu, F. & Guo, H. (2019). Tunable dual-mode emission with excellent thermal stability in Ca₄ZrGe₃O₁₂ : Eu phosphors prepared in air for NUV-LEDs. Journal of the American Ceramic Society, 103(4), 2610-2616. https://dx.doi.org/10.1111/jace.16959 0002-7820 0000-0001-7897-9595 0000-0002-7867-0237 https://hdl.handle.net/10356/151874 10.1111/jace.16959 2-s2.0-85076923726 4 103 2610 2616 en Journal of the American Ceramic Society © 2019 The American Ceramic Society. All rights reserved. |
| spellingShingle | Science::Physics Light-emitting Diode Optical Materials/Properties Wei, Rongfei Li, Kunjiao Feng, Jingjing Tian, Xiangling Shi, Yafei Li, Xiaoman Hu, Fangfang Guo, Hai Tunable dual-mode emission with excellent thermal stability in Ca₄ZrGe₃O₁₂ : Eu phosphors prepared in air for NUV-LEDs |
| title | Tunable dual-mode emission with excellent thermal stability in Ca₄ZrGe₃O₁₂ : Eu phosphors prepared in air for NUV-LEDs |
| title_full | Tunable dual-mode emission with excellent thermal stability in Ca₄ZrGe₃O₁₂ : Eu phosphors prepared in air for NUV-LEDs |
| title_fullStr | Tunable dual-mode emission with excellent thermal stability in Ca₄ZrGe₃O₁₂ : Eu phosphors prepared in air for NUV-LEDs |
| title_full_unstemmed | Tunable dual-mode emission with excellent thermal stability in Ca₄ZrGe₃O₁₂ : Eu phosphors prepared in air for NUV-LEDs |
| title_short | Tunable dual-mode emission with excellent thermal stability in Ca₄ZrGe₃O₁₂ : Eu phosphors prepared in air for NUV-LEDs |
| title_sort | tunable dual mode emission with excellent thermal stability in ca₄zrge₃o₁₂ eu phosphors prepared in air for nuv leds |
| topic | Science::Physics Light-emitting Diode Optical Materials/Properties |
| url | https://hdl.handle.net/10356/151874 |
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