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I07-Surface & interface diffraction	Efficient and spectrally stable blue perovskite light-emitting diodes employing a cationic π-conjugated polymer Shuai Yuan , Lin-Song Cui , Linjie Dai , Yun Liu , Qing-Weii Liu , Yu-Qi Sun , Florian Auras , Miguel Anaya , Xiaopeng Zheng , Edoardo Ruggeri , You-Jun Yu , Yang-Kun Qu , Mojtaba Abdi-Jalebi , Osman M. Bakr , Zhao-Kui Wang , Samuel D. Stranks , Neil C. Greenham , Liang-Sheng Liao , Richard H. Friend Advanced Materials 13 DOI: 10.1002/adma.202103640 Diamond Proposal Number(s): [17223] Open Access Show Abstract ▼ Abstract: Metal halide perovskite semiconductors have demonstrated remarkable potentials in solution-processed blue light-emitting diodes (LEDs). However, the unsatisfied efficiency and spectral stability responsible for trap-mediated non-radiative losses and halide phase segregation remain the primary unsolved challenges for blue perovskite LEDs. In this study, it is reported that a fluorene-based π-conjugated cationic polymer can be blended with the perovskite semiconductor to control film formation and optoelectronic properties. As a result, sky-blue and true-blue perovskite LEDs with Commission Internationale de l'Eclairage coordinates of (0.08, 0.22) and (0.12, 0.13) at the record external quantum efficiencies of 11.2% and 8.0% were achieved. In addition, the mixed halide perovskites with the conjugated cationic polymer exhibit excellent spectral stability under external bias. This result illustrates that π-conjugated cationic polymers have a great potential to realize efficient blue mixed-halide perovskite LEDs with stable electroluminescence.	Sep 2021

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I07-Surface & interface diffraction

Efficient and spectrally stable blue perovskite light-emitting diodes employing a cationic π-conjugated polymer