The study of Y_2O_3-based Oxide Phosphor Thin Film Electroluminescent Devices

该项目介绍了新开发的用于电致发光荧光粉的多组分氧化物主体材料。它们由 Y_2O_3 和另一种二元化合物如 Al_2_O3、Ga_2O_3、Gd_2O_3、In_2O_3、B_2O_3 或 GeO_2 组成。沉积各种Mn激活的(Y_2O_3)_ 1-x -(氧化物) x 磷光体薄膜，同时通过r.f.改变组成。磁控溅射、溶胶-凝胶和后退火。从((Y_2O_3)_1-x-(氧化物)x):Mn磷光体薄膜发射层获得的电致发光和光致发光发射强烈依赖于制备和后退火条件以及组成。采用优化组成制备的(Y_2O_3)_1-x-(氧化物)x:Mn薄膜发光层获得了最高的亮度和光致发光强度。所获得的电致发光和光致发光特性均与薄膜发光层的结晶度相关。在最佳条件下制备并由 1 kHz 交流正弦波电压驱动的 ((Y_2O_3)_<0.6>-(GeO_2)_<0.4>):Mn 和 ((Y_2O_3)_<0.5>-(Ga_2O_3)_<0.5>):Mn 薄膜电致发光器件获得了 7000 cd/m^2 以上的高亮度。

This project introduces newly developed multicomponent oxide host materials for electroluminescent phosphors. These are composed of Y_2O_3 and another binary compound such as Al_2_O3, Ga_2O_3, Gd_2O_3, In_2O_3, B_2O_3 or GeO_2. The various Mn-activated (Y_2O_3)_<1-x>-(oxide)x phosphor thin films were deposited while varying the composition by r.f. magnetron sputtering, sol-gel and postannealed. The obtained electroluminescent and photoluminescent emissions from the ((Y_2O_3)_<1-x>-(oxide)x):Mn phosphor thin-film emitting layers were strongly dependent on the preparation and postannealing conditions as well as on the composition. The highest luminance and photoluminescent intensity were obtained by using a (Y_2O_3)_<1-x>-(oxide)x:Mn thin-film emitting layer prepared with an optimized composition. Both the obtained electroluminescent and photoluminescent characteristics were correlated to the crystallinity of the thin-film emitting layers. High luminances above 7000 cd/m^2 were obtained in ((Y_2O_3)_<0.6>-(GeO_2)_<0.4>):Mn and ((Y_2O_3)_<0.5>-(Ga_2O_3)_<0.5>):Mn thin-film electroluminescent devices fabricated under optimal condition and driven by an ac sinusoidal wave voltage at 1 kHz.