Liu Wenbo, Jiang Zhengyan, Fan Weijun, Zhang Qichun, Sun Xiao Wei
Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen 518060, China.
Guangdong University Key Laboratory for Advanced Quantum Dot Displays and Lighting, Guangdong-Hong Kong-Macao Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and Devices, and Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen 518055, China.
J Phys Chem Lett. 2021 Oct 21;12(41):10197-10203. doi: 10.1021/acs.jpclett.1c02599. Epub 2021 Oct 13.
Dual-color emission in a single perovskite layer would make perovskite light-emitting devices (PLEDs) more competitive compared with other display technologies. However, due to the carrier dynamics in a blended perovskite film and the low reaction activation energy of the halide exchange reaction, it is very difficult to achieve the dual-color emission in a perovskite layer. Here, dual-color electroluminescence (EL) emission in a single perovskite layer has been realized by slowing the energy transfer from wide-bandgap energy levels to narrow-bandgap energy levels. Moreover, the EL spectra can be controlled by modulating the composition of the perovskite layer. When the amount of CHNHI(MAI) in the precursor was varied, white emission with CIE coordinates of (0.33, 0.34) could be achieved. Our work proposes a new strategy for white emission from PLEDs. Also, the analysis and discussion of carrier dynamics in this work may help to enhance our understanding of the working mechanism of PLEDs.
与其他显示技术相比，在单一钙钛矿层中实现双色发射将使钙钛矿发光器件（PLED）更具竞争力。然而，由于混合钙钛矿薄膜中的载流子动力学以及卤化物交换反应的低反应活化能，在钙钛矿层中实现双色发射非常困难。在此，通过减缓从宽带隙能级到窄带隙能级的能量转移，在单一钙钛矿层中实现了双色电致发光（EL）发射。此外，EL光谱可以通过调节钙钛矿层的组成来控制。当前驱体中CHNHI（MAI）的量变化时，可以实现CIE坐标为（0.33, 0.34）的白色发射。我们的工作提出了一种从PLED获得白色发射的新策略。此外，这项工作中对载流子动力学的分析和讨论可能有助于增强我们对PLED工作机制的理解。
