Highly Efficient Perovskite/Organic Hybrid White Electroluminescent Devices with Extended Operational Lifetime and Wide Color Gamut
Abstract
Abstract Rapid and substantial progress is made in monochromatic perovskite light‐emitting diodes (LEDs), however, challenges remain in achieving white electroluminescence for high‐definition display and lighting applications with perovskites as emitters. Here, a proof‐of‐the‐concept configuration is proposed that successfully demonstrates monolithic perovskite/organic hybrid white LEDs (P/O‐WLEDs) with a wide color gamut for the first time. In this configuration, pure‐green and deep‐blue organic emission units are successively superimposed onto a red emission perovskite layer, forming a hybrid emissive system. The unique carrier transporting and luminescent characteristics of the organic emission units facilitate a broadened carrier distribution, high exciton utilization, and narrowband emission peaks. Consequently, the developed P/O‐WLEDs achieve a peak external quantum efficiency of 21.1%, ultralow turn‐on voltage of 2.6 V, and simultaneously a significantly extended operational lifetime of 21.9 h (LT50 at an initial luminance of 500 cd m −2 ). Furthermore, by regulating the charge transport properties through an RbI‐treated perovskite unit and an optimized thin LiF layer, the P/O‐WLEDs not only maintain comparable performance but also demonstrate obviously improved spectral stability and a suitable correlated color temperature, opening a new avenue for the development of display and lighting technologies.
Article Details
Authors (14)
Denghui Liu
Xuewei Nie
Guangdong Basic Research Center of Excellence for Energy and Information Polymer Materials Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou P. R. China
Xin‐Ge Li
College of Chemistry and Chemical Engineering Key Laboratory for Preparation and Application of Ordered Structure Materials of Guangdong Providence Shantou University 243 Daxue Road Shantou 515063 P. R. China
De‐Li Li
Guangdong Basic Research Center of Excellence for Energy and Information Polymer Materials State Key Laboratory of Luminescent Materials and Devices South China University of Technology Wushan Road 381 Guangzhou 510640 P. R. China
Zijian Chen
State Key Laboratory of Fine Chemicals, Frontiers Science Center for Smart Materials, School of Chemical Engineering
Sheng Liao
Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province, Shantou University 2 , Shantou 515063,
Guanwei Sun
Institute of Polymer Optoelectronic Materials and Devices Guangdong Basic Research Center of Excellence for Energy & Information Polymer Materials State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou P. R. China
Baoyan Liang
Jihua Laboratory Foshan Guangdong Province P. R. China
Zhihai Yang
Guangdong Basic Research Center of Excellence for Energy and Information Polymer Materials Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou P. R. China
Zhiheng Wang
Mengke Li
Ming‐De Li
School of Physics and Optoelectronic Engineering & Guangdong Provincial Key Laboratory of Sensing Physics and System Integration Applications Guangdong University of Technology Guangzhou Guangdong P.R. China
Junji Kido
Guangdong Basic Research Center of Excellence for Energy and Information Polymer Materials Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou P. R. China
Shi‐Jian Su
Guangdong Basic Research Center of Excellence for Energy and Information Polymer Materials Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou P. R. China