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采用高温固相反应法分别合成了变价稀土镨和镱离子掺杂的绿色荧光粉[Ba(2-n-1.5x)REx]SiO4:nEu2+ (n=0.03, RE=Pr, Yb;x=0, 0.02,0.05,0.10).结果表明: 所有合成荧光粉的激发峰均为250~400 nm的宽峰, 与近紫外LED的发射光波长相匹配.发射峰位于450~550 nm之间, 是Eu2+的5d-4f跃迁的典型发射.Pr3+和Yb3+的掺入并未改变Ba2SiO4:Eu2+的相组成, 但对荧光强度的影响大, 且与掺杂元素、掺杂量和煅烧温度相关.当掺杂Pr3+和Yb3+的量为x=0.02时, 经1150 ℃煅烧所得荧光粉的发光强度分别是未掺杂时的595%和168%.证明三价稀土离子掺杂可以导致基质中的电荷缺陷而敏化Eu2+离子的发光, 而变价稀土离子的掺杂可以大大提高电荷缺陷, 导致荧光强度的进一步提高.

参考文献

[1] Liu Yuhuan;Liu Rushi .New Rare-Earth Containing(Si_(1-y)Eu_y)_2 Al_2Si_(10)N_(14)O_4 Phosphors for light-Emtting Diodes[J].Journal of Rare Earths,2007(4):392-395.
[2] Nakamura S;Mukai T;Sench M .Candela class high brightness InGaN /AlGaN double heterostructure blue light emitting diodes[J].Applied Physics Letters,1994,64(13):1687.
[3] Barry T L .Fluorescence of Eu2+-activated phases in binary alkaline earth orthosilicate systems[J].Journal of the Electrochemical Society,1968,115:1181.
[4] Barry T L .Luminescent properties of Eu2+and Eu2++Mn2+ activated BaMg2Si207[J].Journal of the Electrochemical Society,1970,117:381.
[5] Kang H S;Hong S K;Kang Y C;Jung K Y Shul Y G Park S B .The enhancement of photoluminescence characteristics of Eu-doped barium strontium silicate phosphor particles by co-doping materials[J].Journal of Alloys and Compounds,2005,402:246.
[6] Jong S K;Yun H P;Sun M K .Temperature-dependent emission spectra of M2SiO4:Eu2+ (M=Ca,Sr,Ba) phosphors for green and greenish white LEDs[J].Solid State Communications,2005,133:445.
[7] Liu Hongli,He Dawei,Shen Fang.Luminescence Properties of Green-Emitting Phosphor (Ba1-x, Srx)2SiO4:Eu2+ for White LEDS[J].稀土学报(英文版),2006(01):121-124.
[8] He H;Fu RL;Song XF;Wang DL;Chen J .White light-emitting Mg0.1Sr1.9SiO4 : Eu2+ phosphors[J].Journal of Luminescence: An Interdisciplinary Journal of Research on Excited State Processes in Condensed Matter,2008(3):489-493.
[9] 石春山;苏锵.变价稀土元素化学与物理[M].北京:科学出版社,1994:28.
[10] Park J C;Moon H K;Kim D K;Byeon S H Kim B C Suh K S.Morphology and cathodoluminescence of Li-doped Gd2O3:Eu3+,a red phosphor operating at low voltages[J].Applied Physics Letters,2000(77):2162.
[11] 祁士群 .稀土Pr<'3+>,Nd<'3+>高能激发态的发光性质研究[D].北京交通大学,2006.
[12] 吕少哲,陈宝玖,黄世华,王笑军,陆丽珠,严懋勋.SrAl12O19∶Pr3+中的热激发[J].物理学报,2003(04):1009-1012.
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