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DEVELOPMENT OF FLAT PANEL DISPLAYS BASED ON ELECTROLUMINESCENCE FROM SEMICONDUCTOR NANOCRYSTALS

基于半导体纳米晶体电致发光的平板显示器的开发

基本信息

批准号：
16560273
负责人：
TOYAMA Toshihiko
金额：
$ 2.43万
依托单位：
OSAKA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2005
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16560273/
关键词：
nanocrystal ZnS rare earth hot electron multi color double insulating low voltage operation electroluminecence 動作解析過渡発光波形 Tm

项目摘要

Thin-film devices utilizing electroluminescence (EL) from ZnS nanocrystals (NCs) doped with activator-ions have been studied for flat panel displays with an emphasis on the blue emission as well as on the improvement of luminance. The device structure was a conventional double-insulating structure consisting of glass substrate/indium tin oxide/insulating layer/ZnS NC phosphor layer/insulating layer/Al electrode. ZnS NCs were formed in the multilayers consisting of (ZnS/interlayer)_m with a period m of 30. The interlayer is for breaking ZnS continuum growth, or for controlling the crystal size of ZnS NCs. Si_3N_4,AIN, and Ta_2O_5 were investigated as the insulating layer, and AlN is the most effective in increasing the luminance, which agrees with the result of 100-K photoluminescence. Furthermore, charge transport analyses revealed that the thickness of the ZnS NC layer, which is almost equivalent with the crystal size of ZnS NCs, influences on the EL efficiency and 8 nm is optimum in … More this experimental series. The material properties of the double-insulating layers are also important, and Si_3N_4 is the most effective in improving the maximum luminance. As for the multi-color emission, blue emission was achieved from ZnS:Tm NCs. The EL spectra of ZnS:Tm NCs consist of blue, quite week red, and infrared bands as found in other Tm-doped phosphors. Nevertheless, being different from other materials, the blue band is the strongest, and the intensity ratio of blue/infrared increases as the applied voltage increases. The voltage evolution of the blue/infrared intensity ratio strongly suggests that the energy distribution of the hot electron shifts to higher with increasing the electric fields in ZnS NCs, i.e., the major EL mechanism of ZnS NCs should be hot-electron-induced impact ionization. Finally, the thin-film device with sub-pixels corresponding to the primary colors has been demonstrated utilizing red emission from ZnS:Mn NCs, green emission from ZnS:Tb NCs, and blue emission from ZnS:Tm NCs. Less

研究了利用掺杂激活剂离子的硫化锌纳米晶(NCS)的电致发光(EL)用于平板显示器的薄膜器件，重点研究了蓝光发射和亮度改善。器件结构为玻璃衬底/铟锡氧化物/绝缘层/硫化锌纳米荧光层/绝缘层/铝电极组成的传统双层绝缘结构。在(ZnS/夹层)_m组成的多层膜中形成了ZNS纳米碳管，周期m为30。中间层用于中断硫化锌的连续生长，或用于控制硫化锌纳米管的晶体尺寸。研究了Si_3N_4、AlN和Ta_2O_5作为绝缘层，发现AlN对提高发光效率最有效，这与100K光致发光的结果一致。此外，电荷输运分析表明，纳米硫化锌的厚度与纳米硫化锌的晶体尺寸基本相同，影响电致发光效率，在…中8 nm是最佳的。更多的是这个实验性的系列。双层绝缘层的材料性能也很重要，其中Si_3N_4对提高最大亮度最为有效。在多色发光方面，ZnS：Tm纳米管实现了蓝光发射。与其他掺Tm荧光粉一样，ZnS：Tm纳米管的电致发光光谱由蓝光、红光和红外带组成。然而，与其他材料不同的是，蓝光带是最强的，并且蓝/红外的强度比随着外加电压的增加而增加。蓝光/红外强度比的电压演化强烈地表明，随着电场的增加，热电子的能量分布向更高的方向移动，即热电子诱导的碰撞电离是主要的电致发光机制。最后，利用ZnS：Mn纳米管的红光发射、ZnS：Tb纳米管的绿光发射和ZnS：Tm纳米管的蓝光发射，实现了亚像素对应于基色的薄膜器件。较少