Orange-Red-emitting Ca9Gd(PO4)7:Eu3+ Phosphors: Judd-Ofelt Analysis and Investigation on the Thermal Stability, Quantum Efficiency for WLED
Orange-red-emitting Eu3+-doped Ca9Gd(PO4)7 phosphors have been obtained by a sol-gel technique. These phosphors, excited by UV (270 nm) and near UV light (394 nm), emit orange-red light in the range of 580–710 nm. The Ca9Gd(PO4)7:7 mol% Eu3+ phosphor annealed at 1100 °C shows the highest PL intensit...
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ChemistrySelect
2021
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| Truy cập trực tuyến: | https://chemistry-europe.onlinelibrary.wiley.com/doi/10.1002/slct.202003891 https://dlib.phenikaa-uni.edu.vn/handle/PNK/2678 https://doi.org/10.1002/slct.202003891 |
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oai:localhost:PNK-26782022-08-17T05:54:47Z Orange-Red-emitting Ca9Gd(PO4)7:Eu3+ Phosphors: Judd-Ofelt Analysis and Investigation on the Thermal Stability, Quantum Efficiency for WLED Luu, Thi Ha Thu Nguyen, Tu Dao, Duc Anh Do, Quang Trung Manh Trung, Tran Tran, Thi Quynh Nhu Nguyen, Thi Huyen Nguyen, Van Quang Nguyen, Duy Hung Dao, Xuan Viet Nguyen, Duc Trung Kien Pham, Thanh Huy Orange-red-emitting Eu3+-doped Ca9Gd(PO4)7 phosphors have been obtained by a sol-gel technique. These phosphors, excited by UV (270 nm) and near UV light (394 nm), emit orange-red light in the range of 580–710 nm. The Ca9Gd(PO4)7:7 mol% Eu3+ phosphor annealed at 1100 °C shows the highest PL intensity. Judd-Ofelt analysis reveals that the neighbor surroundings of Eu3+ ions are asymmetric, and the lowest asymmetry value is found at the dopant ratio of 7 mol%. The optimal phosphor excited by the wavelength of 394 nm displays an excellent thermal stability (∼76.4 % at 160 °C) with an activation energy of 0.163 eV. The corresponding CIE chromaticity coordinates (x; y) and color purity are calculated to be (0.5849; 0.3635) and 84.6 %, respectively. The quantum efficiency values of the Ca9Gd(PO4)7:Eu3+ phosphors coated on UV and near-UV chips are 87.4 % and 5.1 %, respectively. It is the first time that the QE values of Ca9Gd(PO4)7:Eu3+-based red and blue-emitting LEDs are reported. 2021-09-09T08:02:03Z 2021-09-09T08:02:03Z 2021 Article https://chemistry-europe.onlinelibrary.wiley.com/doi/10.1002/slct.202003891 https://dlib.phenikaa-uni.edu.vn/handle/PNK/2678 https://doi.org/10.1002/slct.202003891 en ChemistrySelect |
| institution |
Digital Phenikaa |
| collection |
Digital Phenikaa |
| language |
English |
| description |
Orange-red-emitting Eu3+-doped Ca9Gd(PO4)7 phosphors have been obtained by a sol-gel technique. These phosphors, excited by UV (270 nm) and near UV light (394 nm), emit orange-red light in the range of 580–710 nm. The Ca9Gd(PO4)7:7 mol% Eu3+ phosphor annealed at 1100 °C shows the highest PL intensity. Judd-Ofelt analysis reveals that the neighbor surroundings of Eu3+ ions are asymmetric, and the lowest asymmetry value is found at the dopant ratio of 7 mol%. The optimal phosphor excited by the wavelength of 394 nm displays an excellent thermal stability (∼76.4 % at 160 °C) with an activation energy of 0.163 eV. The corresponding CIE chromaticity coordinates (x; y) and color purity are calculated to be (0.5849; 0.3635) and 84.6 %, respectively. The quantum efficiency values of the Ca9Gd(PO4)7:Eu3+ phosphors coated on UV and near-UV chips are 87.4 % and 5.1 %, respectively. It is the first time that the QE values of Ca9Gd(PO4)7:Eu3+-based red and blue-emitting LEDs are reported. |
| format |
Article |
| author |
Luu, Thi Ha Thu Nguyen, Tu Dao, Duc Anh Do, Quang Trung Manh Trung, Tran Tran, Thi Quynh Nhu Nguyen, Thi Huyen Nguyen, Van Quang Nguyen, Duy Hung Dao, Xuan Viet Nguyen, Duc Trung Kien Pham, Thanh Huy |
| spellingShingle |
Luu, Thi Ha Thu Nguyen, Tu Dao, Duc Anh Do, Quang Trung Manh Trung, Tran Tran, Thi Quynh Nhu Nguyen, Thi Huyen Nguyen, Van Quang Nguyen, Duy Hung Dao, Xuan Viet Nguyen, Duc Trung Kien Pham, Thanh Huy Orange-Red-emitting Ca9Gd(PO4)7:Eu3+ Phosphors: Judd-Ofelt Analysis and Investigation on the Thermal Stability, Quantum Efficiency for WLED |
| author_facet |
Luu, Thi Ha Thu Nguyen, Tu Dao, Duc Anh Do, Quang Trung Manh Trung, Tran Tran, Thi Quynh Nhu Nguyen, Thi Huyen Nguyen, Van Quang Nguyen, Duy Hung Dao, Xuan Viet Nguyen, Duc Trung Kien Pham, Thanh Huy |
| author_sort |
Luu, Thi Ha Thu |
| title |
Orange-Red-emitting Ca9Gd(PO4)7:Eu3+ Phosphors: Judd-Ofelt Analysis and Investigation on the Thermal Stability, Quantum Efficiency for WLED |
| title_short |
Orange-Red-emitting Ca9Gd(PO4)7:Eu3+ Phosphors: Judd-Ofelt Analysis and Investigation on the Thermal Stability, Quantum Efficiency for WLED |
| title_full |
Orange-Red-emitting Ca9Gd(PO4)7:Eu3+ Phosphors: Judd-Ofelt Analysis and Investigation on the Thermal Stability, Quantum Efficiency for WLED |
| title_fullStr |
Orange-Red-emitting Ca9Gd(PO4)7:Eu3+ Phosphors: Judd-Ofelt Analysis and Investigation on the Thermal Stability, Quantum Efficiency for WLED |
| title_full_unstemmed |
Orange-Red-emitting Ca9Gd(PO4)7:Eu3+ Phosphors: Judd-Ofelt Analysis and Investigation on the Thermal Stability, Quantum Efficiency for WLED |
| title_sort |
orange-red-emitting ca9gd(po4)7:eu3+ phosphors: judd-ofelt analysis and investigation on the thermal stability, quantum efficiency for wled |
| publisher |
ChemistrySelect |
| publishDate |
2021 |
| url |
https://chemistry-europe.onlinelibrary.wiley.com/doi/10.1002/slct.202003891 https://dlib.phenikaa-uni.edu.vn/handle/PNK/2678 https://doi.org/10.1002/slct.202003891 |
| _version_ |
1751856260521656320 |
| score |
8.891787 |