Non-Conjugated Gridized Nanopolymers as an Efficient Hole-Transport Material for Blue Perovskite Light-Emitting Diodes.

Despite the remarkable advancements in perovskite light-emitting diode (PeLED) technology, the development of blue PeLEDs has lagged. The primary bottleneck lies in the difficulty of finding hole transport materials (HTMs) that can both match the energy levels of blue perovskite materials and exhibit efficient hole transport performance. Herein, a novel non-conjugated polyethylene carbazole-based polymer (P-AGCz) is developed that has excellent solution processability and serves as an efficient dopant-free HTM for PeLEDs. The flexible non-conjugated polyethylene backbone of P-AGCz provides exceptional film-forming capabilities. Moreover, the A-shaped carbazole-based side chains deepen the HOMO energy level and minimize the recombination energy, enhancing its ability to inject and transport holes within PeLEDs. The PeLEDs employing P-AGCz as a low-cost, dopant-free polymer HTM have attained an external quantum efficiency (EQE) of 3.26%, which is 1.54 times greater than poly(N-vinylcarbazole) (PVK)-based devices, with a brightness enhancement of 584 cd m over the PVK-based devices. Furthermore, the P-AGCz-based devices exhibit higher current efficiency at lower driving voltages, indicating reduced energy consumption and expanded potential for future applications.