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Photoluminescence properties of NaGd(WO_4)_2:Eu^3+ nanocrystalline prepared by hydrothermal method
Jinsheng Liao,Hangying You,Bao Qiu,He-Rui Wen,Ruijin Hong,Weixiong You,Zhipeng Xie 한국물리학회 2011 Current Applied Physics Vol.11 No.3
NaGd(WO_4)_2:Eu^3+ (hereafter NGW:Eu) red-phosphors were synthesized via a facile hydrothermal method at different pH value. X-ray power diffraction (XRD), transmission electron microscope (TEM),energy dispersive X-ray spectra (EDS), photoluminescence excitation and emission spectra and decay curve were used to characterize the NGW:Eu phosphors. It was found that the pH value has a crucial effect on synthesis of the scheelite structure NGW:Eu. The intense red emission is obtained by exciting into the 5^L_6 state with 395 nm, which corresponds to the popular emission line from near-UV LED chips. The values of Ω2,4 experimental intensity parameters (14.9 × 10^-20 and 5.6 × 10^-20 cm^2) are determined. The high emission quantum efficiency and suitable color coordination of the NGW:Eu phosphor suggest the material could be a promising red phosphor for generating white light in phosphor-converted white light emitting diodes (WLEDs).
Qian Zhang,Lei Han,Weizhen Liu,Weixiong You,Anxian Lu,Zhiwei Luo 한양대학교 세라믹연구소 2021 Journal of Ceramic Processing Research Vol.22 No.1
Development of orange light emitting materials cannot be ignored. In this paper, a novel Tb3+/Sm3+ co-doped P2O5-SrO-BaOZnO-glasses have been prepared. The prepared glasses consisted predominantly of Q2 units, and a small amount of Q0 andQ1 units. For absorption spectra of glasses, eight obvious absorption bands were found. Under the excitation of 402 nm and374 nm xenon lamp, the emission spectra and fluorescence lifetimes of glasses showed big difference. Under the excitation of374 nm xenon lamp, there was significant energy transfer process between Sm3+ and Tb3+ ions in glasses. The fluorescencedecay curves conformed to a double-exponential decay function, the average fluorescence lifetimes of glasses G02 ~ G10 were2.38 ms, 2.67 ms, 1.96 ms, 1.81 ms, and 1.61 ms with the increasing of Sm2O3 content, and the glasses emitted a distinct orangelight. The distinctive properties indicate that this system glass has potential applications in display devices.