Al_2O_3-B_2O_3-Eu_2O_3体系的振动光谱和发光特性

Vibrational Spectrum and Luminescence Properties of the System Al_2O_3-B_2-O_3-Eu_2O_3

采用高温固相反应法，合成了一系列不同组份的磷光体，测定了它们的振动光谱．结果表明，随着Al／B比的减小，在1100～1000cm－1的区域内的振动光谱没有明显变化，铕离子不可能进入Al18B4O33的晶格中；振动光谱的背底升高，非晶相逐渐增加．研究了Al2O3－B2O3-Eu2O3中Eu3＋离子的光谱特性，发现随着Al／B比的减少，Eu3＋离子的存在相由晶相逐渐向非晶相转化。在非晶相中，Eu3＋离子的声子伴带表明电子与声子的耦合强度随着Al／B比的减少而减小，Eu3＋离子的发射强度相应的增加，这与多声子弛豫的理论一致．

The system Al2O3-B2O3-Eu2O3, with Al/B ratio varying from 4.5 to 2 and Eu/(Al+B)=0.02, was syuthesized by sohd state reaction.The vibrational spectra of the sys tem Al2O3-B2O3 were investigated.It was found that no defimite change in the regions of 1200~1000cm-1 due to the absorption BO4 groups with decreasing Al/B ratio, indicatimg no Al3+ion was substituted by Eu3+ ions and other changs revealed that there was an amorphous phase and Eu3+ ions may dope into the amorphous phase. The studies on the luminescent properties of the system Al2O3-B2O3 also show that Eu3+ ions dope into amorphous phase.The investigations on the phouon sideband of Eu3+ indicate that electron-phonon coupling strength decreases with Al/B ratio change from 3 to 2 Ieading to the non-radiative decay rate decreases and the Eu3+ennssion intensity increase.