Synthesis of the uniform hollow spherical Sr2SiO4:Eu2+ phosphors via an h-BN protective method |
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| Affiliation: | 1. Department of Physics, King Mongkut''s University of Technology Thonburi, Bangkok 10140, Thailand;2. IMRAM, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan;3. NICHe, Tohoku University 6-6-10 Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-8579, Japan;4. Institute of Physics, AS CR, Cukrovarnicka 10, Prague 16253, Czech Republic;1. College of Material Science and Engineering, Tongji University, Shanghai 201804, China;2. College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, China;1. Chinese Academy of Science Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei Anhui, People’s Republic of China;2. Materials Science and Engineering Department, University of Ioannina, GR-451 10 Ioannina, Greece;3. School of Energy Science and Engineering, University of Electronic Science and Technology of China, 2006 Xiyuan Road, Chengdu, People’s Republic of China;1. Departamento de Engenharia de Materiais, Universidade Federal do Rio Grande do Norte, 59072-970, Natal, RN, Brazil;2. UACSA, Universidade Federal Rural de Pernambuco, 54510-000, Cabo de Santo Agostinho, PE, Brazil;3. LIEC, Universidade Federal de São Carlos, 13565-905, São Carlos, SP, Brazil;4. Instituto de Física de São Carlos, Universidade de São Paulo, 13566-590, São Carlos, SP, Brazil |
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| Abstract: | The uniform hollow spherical Sr2SiO4:Eu2+ green emitting phosphors have been successfully synthesized using hollow silica spheres as templates by an h-BN protective method. The scanning electron microscopy (SEM) and transmission electron microscopy (TEM) results directly confirmed the existence of the hollow spherical structure with a narrow size distribution and a shell thickness of 15–25 nm. The h-BN protective film, observed by high resolution TEM, plays an important role in the formation of the hollow spherical morphology and the improvement of photoluminescence properties. Comparing with the Sr2SiO4:Eu2+ micron-phosphor prepared by the traditional solid state reaction method, the hollow spherical phosphor with nano-sized grains exhibits stronger green emission under ultraviolet–blue light excitation. This could be attributed to the elimination of surface defects by the h-BN coating. This research gives an economic and convenient way to synthesize uniform spherical phosphors with high quantum efficiency. |
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| Keywords: | Sol–gel growth Optical properties Core–shell structure White light-emitting diodes |
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