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中南大学学报(自然科学版)

Journal of Central South University

第42卷    第5期    总第201期    2011年5月

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文章编号:1672-7207(2011)05-1270-06
低温燃烧合成Sr1.93Ba0.05SiO4:Eu荧光粉及其发光性能
强耀春1, 2,张宝林1, 2

(1. 桂林理工大学 有色金属及材料加工新技术教育部重点实验室,广西 桂林,541004;
2. 桂林理工大学 材料科学与工程学院,广西 桂林,541004
)

摘 要: 以尿素为燃料,金属硝酸盐为氧化剂,(C2H5O)4Si为硅源,采用低温燃烧及回火还原处理合成用于白光LED的Sr1.93Ba0.05SiO4:Eu荧光粉。讨论助熔剂SrCl2用量和回火温度对荧光粉相组成的影响,研究合成产物的发光性能,初步提出合成反应机制。燃烧合成中熔融的SrCl2为整个反应提供了一个半流动态的环境,促使生成的杂相SrCO3分解。低温燃烧直接产物S­r1.93Ba0.05SiO4:0.02Eu3+非晶材料在波长393 nm近紫外光的激发下最强发射峰值是波长为612 nm红光;处理后晶相产物Sr1.93Ba0.05SiO4:0.02Eu2+发射峰值是波长为480 nm的蓝光和543 nm的黄绿光,分别是由处于不同格位上的Eu2+(Ⅱ)和Eu2+(Ⅰ)的5d→4f跃迁产生的。用不同的近紫外光(380~410 nm)激发时,样品发射出的蓝光(480 nm)和黄绿光(543 nm)的强度都随着激发光波长的增大而减小,而且蓝光的强度减小非常明显,同时,随着激发光波长的增大黄绿光波长增大。

 

关键字: 低温燃烧合成;正硅酸盐荧光粉;发光二极管;发光性能

Low temperature combustion synthesis and luminescence of Sr1.93Ba0.05SiO4:Eu phosphor
QIANG Yao-chun1, 2, ZHANG Bao-lin1, 2

1. Key Laboratory of Nonferrous and Materials Processing Technology, Ministry of Education,
Guilin University of Technology, Guilin 541004, China;
2. College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, China

Abstract:The Sr1.93Ba0.05SiO4:Eu phosphors for white-light-emitting diodes were synthesized using low temperature combustion method. The influences of the amount of the flux SrCl2 and calcining temperature on the phase compositions of the products were studied and their photoluminescence was investigated. The reaction mechanism was proposed initially. The SrCl2 flux not only provides a semi-dynamic environment in which the combustion reaction takes place, but also avoids the unintended phase SrCO3. Amorphous material Sr1.93Ba0.05SiO4:0.02Eu3+ emits the strongest peak at 612 nm red light when it is excited in the 393 nm near ultraviolet (UV) light. The emission spectrum of Sr1.93Ba0.05SiO4:0.02Eu2+ fabricated by the low temperature combustion method and calcined in reducing atmosphere shows a green-yellow broadband emission peak at around 543 nm and a blue band at 480 nm, which are respectively generated by the 5d → 4f transitions of the Eu2+ (Ⅱ) and Eu2+ (Ⅰ) at different lattice positions. When excited with near UV (380-410 nm), the intensity of the blue light (480 nm) and yellow green light (543 nm) increases with the decrease of the excitation wavelength, and the intensity of the blue light decreases obviously, and at the same time, with the increase of the excitation wavelength, the wavelength of the yellow-green light emitted increases.

 

Key words: low temperature combustion synthesis; orthosilicate phosphor; light-emitting diode; luminescence properties

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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