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Orange-Red-emitting Ca9Gd(PO4)7:Eu3+ Phosphors: Judd-Ofelt Analysis and Investigation on the Thermal Stability, Quantum Efficiency for WLED

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Main Author: Luu Thi Ha Thu
Other Authors: Nguyen Tu
Format: Article
Language:English
Published: ChemistrySelect 2021
Online Access:https://chemistry-europe.onlinelibrary.wiley.com/doi/10.1002/slct.202003891
https://dlib.phenikaa-uni.edu.vn/handle/PNK/1973
https://doi.org/10.1002/slct.202003891
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spelling oai:localhost:PNK-19732022-08-17T05:54:53Z 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 Viẹt Nguyen Duc Trung Kien Pham Thanh Huy Q2 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. 2021-07-06T04:23:59Z 2021-07-06T04:23:59Z 2021 Article https://chemistry-europe.onlinelibrary.wiley.com/doi/10.1002/slct.202003891 https://dlib.phenikaa-uni.edu.vn/handle/PNK/1973 https://doi.org/10.1002/slct.202003891 en application/pdf ChemistrySelect
institution Digital Phenikaa
collection Digital Phenikaa
language English
description Q2
author2 Nguyen Tu
author_facet Nguyen Tu
Luu Thi Ha Thu
format Article
author Luu Thi Ha Thu
spellingShingle Luu Thi Ha Thu
Orange-Red-emitting Ca9Gd(PO4)7:Eu3+ Phosphors: Judd-Ofelt Analysis and Investigation on the Thermal Stability, Quantum Efficiency for WLED
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/1973
https://doi.org/10.1002/slct.202003891
_version_ 1751856256946012160
score 8.891053

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