Low temperature combustion synthesis and luminescence of Sr1.93Ba0.05SiO4:Eu phosphor

作者：Qiang Yao Chun; Zhang Bao Lin^*

来源：Journal of Central South University(Science and Technology), 2011, 42(5): 1270-1275.

• Blue light
• Broadband emission
• Calcining temperature
• Combustion reactions
• Emission spectrums
• Excitation wavelength
• Green light
• Lattice positions
• Low temperature combustion
• Low temperature combustion synthesis
• Luminescence properties
• Near ultraviolet
• Orthosilicate
• Reaction mechanism
• Red light
• Reducing atmosphere
• White light emitting diodes

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 &rarr 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.

• 出版日期2011
• 单位桂林理工大学