Gan Zhang, Zhixiang Ren, Yucai Yuan, Shiyu Xing, Baodan Zhao, Chen Zou, Dawei Di
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Temperature Characterization of Perovskite LEDs by Electroluminescence
Despite the rapid progress in perovskite light-emitting diodes (PeLEDs), achieving high stability remains an outstanding challenge. PeLEDs produce heat during operation, raising the temperatures, which accelerate device degradation. To determine the PeLED temperatures, a very limited number of techniques represented by infrared thermal imaging (ITI) are employed. However, ITI mainly characterizes the temperature of the exposed top surface of the device, leaving the actual temperature in the perovskite emissive layer unresolved. Here, we address this challenge by directly characterizing the temperature of the perovskite layer via an electroluminescence (EL) analysis. Model PeLEDs emitting in the near-infrared (FAPbI3), red (FA0.5Cs0.5PbI2Br) and green (FA0.6Cs0.7PbBr3) spectral regions are tested. Urbach energies related to thermal broadening are obtained from the EL spectra, enabling real-time tracking of the perovskite emissive layer temperature under working conditions. Our results demonstrate that the EL analysis is a simple and effective method for the operando temperature characterization of PeLEDs.
期刊介绍:
Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including:
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