AI Article Synopsis
- Solution-processed quasi-2D perovskites with self-assembled quantum well structures show improved exciton binding energy, making them great for light emission applications.
- Post-annealing is crucial for enhancing the composition of quantum wells, affecting external quantum efficiency (EQE) and device stability; longer annealing times improve stability but decrease EQE.
- Adding trimethylolpropane trimethacrylate (TPTA) helps reduce defects, balancing the decrease in EQE with improved stability, leading to more efficient and stable perovskite light-emitting diodes.
Article Abstract
Solution-processed quasi-two-dimensional (quasi-2D) perovskites with self-assembled multiple quantum well (QW) structures exhibit enhanced exciton binding energy, which is ideal for use as light emitters. Here, we have found that postannealing is important to promoting the QWs' composition transfer, and we explored the correlation among the annealing time, the external quantum efficiency (EQE), and the operational stability of the device. During thermal annealing, the low- QWs will gradually convert to high- phases, accompanied by an increase in grain size. The EQE and working stability of the device exhibit different annealing-time dependences; that is, with the extension of the annealing time, the EQE gradually decreases while the working stability improves. By introducing trimethylolpropane trimethacrylate (TPTA) to passivate the emitting-region defects, the annealing-time dependence of the EQE was effectively eliminated due to the reduction of the nonradiative recombination rate, wherefore high efficiency and stability can be achieved simultaneously. Our research provides an effective way to develop highly efficiency and stable perovskite light-emitting diodes.
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| http://dx.doi.org/10.1021/acs.jpclett.1c03413 | DOI Listing |
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