Luminescence properties of Eu2+-activated alkaline-earth silicon-oxynitride MSi2O2-δN2+2/3δ (M = Ca, Sr, Ba):: A promising class of novel LED conversion phosphors
Luminescence properties of Eu2+-activated alkaline-earth silicon-oxynitride MSi2O2-δN2+2/3δ (M = Ca, Sr, Ba):: A promising class of novel LED conversion phosphors
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DOI：
10.1021/cm050175d
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发表时间：
2005-06-14
影响因子：
8.6
通讯作者：
Hintzen, HT
中科院分区：
文献类型：
--
作者：
Li, YQ;Delsing, ACA;Hintzen, HT
研究了Eu ~（2+）激活的碱土氮氧化硅的发光性质。在BaO-SiO_2-Si_3 N_4系统中，合成了一种新的BaSi_2 O_2N_2化合物，其晶胞参数为a14.070（4）埃，B = 7.276（2）埃，c = 13.181（3）埃，β = 107.74（6）度。所有的MSi 2 O2-delta N2+2/3 delta：Eu 2+（M = Ca、Sr、Ba）材料都可以在UV到可见光区域（370-460 nm）中被有效激发，使得它们作为用于LED应用的转换磷光体是有吸引力的。BaSi_2 O_2N_2：Eu ~（2+）在490-500 nm处有蓝绿色发射，CaSi_2 O_2-δ N_2 +2/3 δ：Eu ~（2+）在560 nm处有黄色发射（δ近似为0），SrSi_2 O_2-δ N_2 +2/3 δ：Eu ~（2+）在530 - 570 nm处有绿黄色发射峰（δ近似为1），位置取决于δ的精确值。BaSi 2 O2 N2：Eu 2+由于其非常小的斯托克斯位移而对来自InGaN基LED的蓝光具有高转换效率，因此是用于白光LED的最有前途的转换磷光体。
The luminescence properties of Eu2+-activated alkaline-earth silicon-oxynitrides have been studied. In the BaO-SiO2-Si3N4 system, a new BaSi2O2N2 Compound was obtained having the monoclinic structure with lattice parameters a 14.070(4) angstrom, b = 7.276(2) angstrom, c = 13.181(3) angstrom, beta = 107.74(6)degrees. All MSi2O2-delta N2+2/3 delta:Eu2+ (M = Ca, Sr, Ba) materials can be efficiently excited in the UV to visible region (370-460 nm), making them attractive as conversion phosphors for LED applications. A blue-green emission at 490-500 is observed for BaSi2O2N2:Eu2+, yellow emission at 560 nm for CaSi2O2-delta N2+2/3 delta:Eu2+ (delta approximate to 0), and a green-yellow emission peaking from 530 to 570 nm for SrSi2O2-delta N2+2/3 delta:Eu2+ (delta approximate to 1), the position depending on the exact value of delta. BaSi2O2N2:Eu2+ is the most promising conversion phosphor for white-light LEDs due to its high conversion efficiency for blue light from InGaN-based LEDs related to its very small Stokes shift.