High-efficiency blue and white electroluminescent devices based on non-Cd I−III−VI quantum dots

Optical properties of multinary copper chalcogenide semiconductor nanocrystals and their applications in electroluminescent devices

“…Yang课题组 [24] 通过延长纳米晶壳层的生长时间, 并在 壳层生长过程中不断补充前驱体来调节壳层厚度及核/ 壳界面处的合金化程度, 最终得到尺寸为3.8~7. , 外量子效率超过4%(4.6%) [94] . 基于 多元铜基硫族纳米材料的蓝光和白光电致发光器件的 器件结构及性能如图10(a)所示.…”

“…和3.43 cd A -1 提升到2785 cd m -2 和5.75 cd A -1 [86] , 器件 性能的提升归因于Mg 2+ 的引入可使ZnO导带能级升高, 图 10 (网络版彩色)基于多元铜基纳米材料的电致发光器件性能表征结果. (a) 蓝光和白光器件的结构及器件性能示意图 [94] ; (b) 配体交换前后 diagram of structure and performance of blue and white devices [94] ; (b) schematic diagram of Cu-In-S/ZnS nanocrystals and device performance before and after ligand exchange [88] 降低了发光层与电子传输层之间的能级势垒, 减少了 阴极和电子传输层之间的电荷积累, 减少了俄歇复合 的概率. 胶体ZnO纳米颗粒作为电子传输层的电子迁 移率高于空穴迁移率, 会造成电荷在电子传输层和纳 米晶发光层界面处的电荷积累.…”

“…Figure 10 (Color online) Device performance of the electroluminescent devices based on multinary copper-based nanomaterials. (a) Schematic diagram of structure and performance of blue and white devices[94] ; (b) schematic diagram of Cu-In-S/ZnS nanocrystals and device performance before and after ligand exchange…”

Blue quantum dot-based electroluminescent light-emitting diodes

“…In this case, several non-Cd materials, such as ZnSe, InP, Cu-based QDs, and carbon dots, have been investigated in EL devices. 98,107,118,123 Nevertheless, the EL peaks of these devices are mostly above 480 nm, and the device performance shows a huge margin with conventional QD-LEDs using Cd-based QDs. Therefore, researchers must urgently optimize synthetic methods to synthesize nanocrystals with few defects and uniform sizes as well as device architectures to balance charge injection and transport in devices.…”

“…The related QD-LEDs demonstrated a record Z EQE of 7.1% and a peak current efficiency of 11.8 cd A À1 by all-solution-processed fabrication, corresponding to the record quantities among non-Cd QD-based blue EL devices reported to date. This work accelerates the commercialization of non-Cd QD LEDs 118. 4.4 Carbon dot-based QD-LEDsCDs generally comprise abundant elements and are free of heavy metals.…”