Zhang Qing, Yu Hongtao, Liu Ziwei, Lu Yao, Ye Danqing, Qian Jie, Wu Yanan, Gu Wenwen, Ma Ben, Zhang Liuquan, Duan Yu, Liu Lihui, Cao Kun, Chen Shufen, Huang Wei
Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors, Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts & Telecommunications (NUPT) 9 Wenyuan Road Nanjing 210023 China
State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University Changchun 130012 China.
RSC Adv. 2019 Jul 4;9(36):20931-20940. doi: 10.1039/c9ra02730k. eCollection 2019 Jul 1.
Perovskite quantum dot (PQD) light-emitting diodes (LEDs) have rapidly developed in the past several years due to the excellent optoelectronic properties of lead halide perovskites. However, PQD LEDs using graphene electrodes have not been reported despite their huge potential for applications in flexible displays and lighting sources. Herein, graphene was first used as the electrode of PQD LEDs. To overcome graphene's limitations such as hydrophobicity and graphene-induced film nonuniformity, the modification of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) with Triton X-100 and dimethyl sulfoxide (DMSO) codoping was reported, which not only improved the wettability of the graphene surface and the sequent film quality, but also reduced the dissolution of the PQD solvent to the bottom poly[,'-bis(4-butylphenyl)-,'-bis(phenyl)-benzidine] and PEDOT:PSS. More importantly, the synergistic effect of Triton X-100 and DMSO altered the PEDOT:PSS morphology from a coiled structure to a nanofibril conductive network, sufficiently enhancing the electrical conductivity of PEDOT:PSS. With this modification strategy, green PQD LEDs with CHNHPbBr emission layers were successfully fabricated on graphene anodes, with 3.7- and 4.4-fold enhancements in luminance and current efficiency, respectively, compared to those of their counterparts without PEDOT:PSS modification. The film modification strategy and graphene-based PQD LEDs in this work are expected to shed light on the further design and manufacture of flexible highly efficient PQD display and lighting devices.
由于卤化铅钙钛矿具有优异的光电性能，钙钛矿量子点（PQD）发光二极管（LED）在过去几年中得到了迅速发展。然而，尽管基于石墨烯电极的PQD发光二极管在柔性显示器和照明光源方面具有巨大的应用潜力，但尚未见相关报道。在此，首次将石墨烯用作PQD发光二极管的电极。为了克服石墨烯的局限性，如疏水性和石墨烯引起的薄膜不均匀性，报道了用 Triton X-100 和二甲基亚砜（DMSO）共掺杂对聚（3,4-乙撑二氧噻吩）：聚（苯乙烯磺酸盐）（PEDOT:PSS）进行改性，这不仅提高了石墨烯表面的润湿性和后续薄膜质量，还减少了 PQD 溶剂对底部聚[,'-双（4-丁基苯基）-,'-双（苯基）-联苯胺]和 PEDOT:PSS 的溶解。更重要的是，Triton X-100 和 DMSO 的协同作用使 PEDOT:PSS 的形态从卷曲结构转变为纳米纤维导电网络，充分提高了 PEDOT:PSS 的电导率。采用这种改性策略，成功地在石墨烯阳极上制备了具有 CHNHPbBr 发光层的绿色 PQD 发光二极管，与未进行 PEDOT:PSS 改性的同类器件相比，亮度和电流效率分别提高了 3.7 倍和 4.4 倍。这项工作中的薄膜改性策略和基于石墨烯的 PQD 发光二极管有望为柔性高效 PQD 显示和照明器件的进一步设计和制造提供启示。
