Preparation of M2B5O9Cl:Eu2+ (M=Sr,Ca) blue phosphors by a facile low-temperature self-reduction method and their enhanced luminescent properties |
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| Affiliation: | 1. Key Laboratory for Macromolecular Science of Shaanxi Province, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi''an 710062, China;2. School of Chemistry & Chemical Engineering, Shaanxi Xueqian Normal University, Xi''an 710100, China;1. Department of Physics, Sefako Makgatho Health Science University, P. O. Box 94, Medunsa, 0204, South Africa;2. Department of Mathematics, Non Destructive Testing and Physics, Vaal University of Technology, Andries Potgieter Blvd, Vanderbijlpark, 1900, South Africa;3. Department of Physics, University of Pretoria, Pretoria, 0002, South Africa;4. Department of Chemistry, School of Science in the College of Science Engineering and Technology, University of South Africa, Preller Street, Muckleneuk Ridge, City of Tshwane, P. O Box 392, UNISA 0003, South Africa;5. Department of Chemistry, Sefako Makgatho Health Science University, P. O. Box 94, Medunsa, 0204, South Africa;6. Department of Physics, University of the Free State (Qwaqwa Campus), Private Bag X13, Phuthaditjhaba 9866, South Africa;7. Department of Chemical and Physical Sciences, Walter Sisulu University, Mthatha, South Africa;1. School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;2. School of Environmental Science and Engineering, Nanjing Tech University, Nanjing 211816, China;1. Center for Computational Materials Science, Department of Physics, University of Malakand, Chakdara, Pakistan;2. Department of Physics, Faculty of Science, King Khalid University, P.O. Box 9004, Abha, Saudi Arabia;3. Department of Physics, Faculty of Science, Port Said University, Port Said, Egypt;4. Gomal University, Dera Ismail Khan, Pakistan;1. Key Laboratory of Advanced Structural-Functional Integration Materials & Green Manufacturing Technology, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;2. Nuclear Fuel Cycle Research Theme, Australian Nuclear Science and Technology Organisation, Locked Bag 2001, Kirrawee DC, NSW, 2232, Australia |
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| Abstract: | In this work, through a facile method of low-temperature (only 350 °C) self-reduction, 1D nano-sized M2B5O9Cl:Eu2+ (M = Sr, Ca) blue phosphors with highly efficient performance can be obtained. The crystal structure, morphology and photoluminescence (PL) properties including thermal stability of M2B5O9Cl:Eu2+ (M = Sr, Ca) phosphors were investigated. The M2B5O9Cl:Eu2+ (M = Sr, Ca) phosphors show broad band excitation spectra and narrow band emission spectra. The photoluminescence quantum yields (PLQY) of M2B5O9Cl:Eu2+ (M = Sr, Ca) are as high as 98% and 87.2%, respectively. Furthermore, the color purities of M2B5O9Cl:Eu2+ (M = Sr, Ca) can reach 99.1% and 93.2%, respectively. When heated up to 150 °C, the emission intensities of M2B5O9Cl:Eu2+ (M = Sr, Ca) phosphors can still keep 72.7% and 80.0%, respectively. Finally, the above-mentioned phosphors exhibit outstanding performance when manufacturing WLEDs. |
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| Keywords: | Low-temperature self-reduction Borate phosphor Ultra-high quantum yield High color purity Rare earths |
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