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Junho Jeong,Kiwan Jang,HoSueb Lee,SoungSoo Yi,JungHyun Jeong,JongHo Park,Changdae Kim 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.6
KSrPO4:Eu2+x, Mn2+y and KSr(1-x-y)PO4:Eu2+x, Mn2+y phosphors (x = 0.01 and y = 0, 0.01, 0.02 and 0.03) were prepared using a solid state reaction method by taking non-stoichiometric and stoichiometric amounts, respectively, of Eu2+ and Mn2+ ions. The photoluminescence (PL) properties and the energy transfer Eu2+ → Mn2+ of the prepared samples were investigated for UV-based white-light-emitting diodes (UV-based LEDs). The emission spectrum shows an intense blue emission at 430 nm (λex = 356 nm) with a full width at half maximum (FWHM) of 40 nm for the KSrPO4:Eu2+x (x = 0.01) phosphor and at 427 nm (λex = 356 nm) with a FWHM of 31 nm for the KSr(1-x)PO4:Eu2+x (x = 0.01) phosphor. The efficiency of the energy transfer Eu2+ →Mn2+ of KSr(0.99-y)PO4:Eu2+0.01, Mn2+y (y = 0.01, 0.02 and 0.03) was very low. The observed results are discussed in connection with the occupation of sites by Eu2+ ions and the KSrPO4:Eu2+x phosphor prepared by using the non-stoichiometric doping method has been suggested to be more efficient for white-light UV-based LEDs.
Shin, Sang Su,Kang, Deok Hwa,Kim, Dae Il,Choi, In Gook,Seong, Min Hyeok,Yi, SoungSoo American Scientific Publishers 2018 Journal of Nanoscience and Nanotechnology Vol.18 No.3
<P>Er3+ and Yb3+ co-doped LaVO4 phosphors were synthesized by the facile solid state reaction method. Er3+ ions concentrations were changed from 0.01 to 0.2 mol for the fixed Yb3+ ions concentration at 0.15 mol. The crystalline structures of the phosphors were investigated by X-ray diffraction (XRD). The composition of the phosphors were investigated by X-ray photoelectron spectroscopy (XPS) analysis. The photoluminescence emissions based on the blue emission near 466 nm and green emission near 553 nm were observed and the highest emission intensity occurred for the sample LaVO4:Yb-0.15, Er-0.20. The green and red up-conversion emissions were observed in Er3+, Yb3+ co-doped LaVO4 phosphors under the excitation of 980 nm laser diode. LaVO3:Yb3+, Er3+ phosphors could be utilized to produce green colored LEDs by excitation for infra-red LED.</P>