文献类型：期刊文献

英文题名：White organic light emitting diodes based on localized surface plasmon resonance of Au nanoparticles and neat thermally activated delayed fluorescence and phosphorescence emission layers

作者：Mu, Haichuan[1];Yao, Mengqiang[1];Wang, Ruibin[2];Qian, Min[1];Xie, Haifen[1];Wang, Dingshu[1]

机构：[1]East China Univ Sci & Technol, Sch Sci, Dept Phys, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]Shanghai Jiao Tong Univ, Instrumental Anal Ctr, 800 Dongchuan Rd, Shanghai 200240, Peoples R China

年份：2020

卷号：220

外文期刊名：JOURNAL OF LUMINESCENCE

收录：;EI(收录号：20200508119065);WOS:【SCI-EXPANDED(收录号:WOS:000512899700053)】；

基金：This work is supported by National Natural Science Foundation of China (Grant No.61804054) and Natural Science Foundation of China (18ZR1410400).

语种：英文

外文关键词：WOLEDs; TADF; LSPR; Neat emission layer

摘要：White organic light emitting diodes (WOLEDs) incorporating gold (Au) nanoparticles (NPs) beneath PEDOT:PSS hole injection layer (HIL) and employing neat blue DMAC-DPS(B) and green 4CzIPN(G) thermally activated delayed fluorescence (TADF) emission layer (EML) together with sandwiched ultrathin red phosphorescence Ir (piq)(2)(acac)(R) EML have been fabricated and the effects of the localized surface plasmon resonance (LSPR) of Au NPs and EML thickness on the electmluminescence (EL) performance are investigated. It is found that EML thickness imposes vital influence on the EL performance of the WOLEDs and the WOLEDs with the embedded Au NPs and simple EML structure with optimal thickness of G(15 nm)/R(0.3 nm)/B(15 nm) demonstrate maximum power efficiency (PE), external quantum efficiency (EQE) and color rendering index (CRI) around 11.73 lm/w, 10.51% and 94, indicating the achievement of balance between EL efficiency and CRI by carefully adjustment of EML thickness with the presence of Au NPs. Furthermore, the LSPR effects from the Au NPs on the EL efficiency and CRI have been clearly demonstrated. Especially the green and red light emission is dramatically enhanced leading to enormous improvement of CRI, which can be ascribed to the remarkable enhancement of energy transferring inside G(15 nm)/R(0.3 nm)/B(15 nm) EML proved by the much shortened decaying lifetime at 475 and 550 nm from transient photoluminescence(PL) decaying testing. Almost double enhancement of the total fluorescence efficiency (including prompt fluorescence (PF) and delayed fluorescence (DF)) at 550 nm can be obtained with the assistance of LSPR from Au NPs, which increase from 23.85% to 49.82% and 15.22%-28.86% for respective EML of G(15 nm)/B(15 nm) and G(15 nm)/R(0.3 nm)/B(15 nm). The decaying dynamics including the DF, PF, phosphorescence (PH) and energy transferring inside G(15 nm)/R(0.3 nm)/B(15 nm) EML with and without embedded Au NPs is discussed in details. The study provides an easy way to utilize the LSPR of Au NPs together with simple neat TADF and phosphorescent EML to develop high quality WOLEDs.