Center for Advanced Optoelectronic Functional Materials Research & Key Laboratory for UV Light-Emitting Materials and Technology of the Ministry of Education, Northeast Normal University, 5268 Renmin Street, Changchun 130024, China.
Dalton Trans. 2013 Dec 14;42(46):16311-7. doi: 10.1039/c3dt51958a.
A multiphase strategy is proposed and successfully applied to make the insulating green phosphor CaCeAl3O7:Tb(3+) conductive in the form of 12CaO·7Al2O3-CaCeAl3O7:Ce(3+),Tb(3+). The phosphor shows bright green-light emission with a short lifetime (2.51 ms) under low-voltage electron beam excitation (3 kV). The green photo- and cathodoluminescence from (5)D4-(7)F(J) (J = 6, 5, 4, 3) transitions of Tb(3+) are significantly enhanced in comparison with pure C12A7:Tb(3+). It was confirmed that this enhancement is the consequence of the joint effects of energy transfer from Ce(3+) to Tb(3+) and broadening of the absorption spectrum of Ce(3+) due to the existence of multiple phases. In particular, under 800 V electron beam excitation, cathodoluminescence is improved by the modified electrical conductivity of the phosphor. When compared to the commercial Zn2SiO4:Mn(2+) with a long luminescence lifetime of 11.9 ms, this conductive green phosphor has greater advantage for fast displays.
提出并成功应用了一种多相策略，使绝缘绿色荧光粉 CaCeAl3O7:Tb(3+) 以 12CaO·7Al2O3-CaCeAl3O7:Ce(3+),Tb(3+) 的形式具有导电性。在低电压电子束激发（3kV）下，该荧光粉显示出明亮的绿光发射，具有短的荧光寿命（2.51ms）。与纯 C12A7:Tb(3+)相比，Tb(3+)的（5）D4-(7)F(J)（J = 6,5,4,3）跃迁的绿光光致发光和阴极发光显著增强。证实这种增强是 Ce(3+)到 Tb(3+)的能量转移和由于多相存在而导致 Ce(3+)吸收光谱展宽的共同作用的结果。特别是在 800V 电子束激发下，磷光体的改良电导率提高了阴极发光。与具有 11.9ms 长荧光寿命的商用 Zn2SiO4:Mn(2+)相比，这种导电绿色荧光粉在快速显示方面具有更大的优势。
