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Nonconventional luminescent polymers (NCLPs) have attracted considerable attention due to their unique luminescence behavior. Although various routes can be employed to synthesize such vinyl-based NCLP, the dependence of their photophysical...

Perovskite light‐emitting diodes (PeLEDs) are promising candidates for displays and solid‐state lighting due to their tunable colors, high conversion efficiency, and low cost. However, the performance of deep blue PeLEDs lags far behind that of near‐infrared, red, and green ones. Here, the ligand concentration on the perovskite surface is regulated by introducing a small organic molecule 3‐(5,9‐dioxa‐13b‐boranaphtho [3,2,1‐d,e] anthracene‐7‐yl)‐9‐phenyl‐9H‐carbazole (BOCzPh) to reduce the defects in the mixed‐halogen perovskite lattice and improve the exciton binding energy of perovskite quantum dots (QDs). Finally, deep blue PeLEDs with an emission peak at 469 nm, a peak external quantum efficiency of 2.8%, and a maximum brightness of 851 cd m−2 are obtained. Owing to the post‐passivation of QDs by BOCzPh molecules, the emission spectra of the mixed‐halide perovskites are stabilized and the luminous efficiency of the devices is improved simultaneously. This work provides a new approach to realize spectrally stable and efficient deep blue PeLEDs.

Nonconventional luminescent polymers (NCLPs) have attracted considerable attention due to their unique luminescence behavior. Although various routes can be employed to synthesize such vinyl-based NCLP, the dependence of their photophysical properties on the polymerization method used and thus potential small variations of the overall macromolecular architecture is rarely reported. In this study, we have investigated in detail the luminescence behavior of polyacrylonitriles (PANs) synthesized with two different polymerization methods, namely by free-radical polymerization (FRP), and reversible addition-fragmentation chain transfer (RAFT). Dependent on the polymerization route and initiator used, the PANs show distinct PL and excitation wavelengths, and their emission covers a wavelength range from 400 to 630 nm, respectively. Moreover, the synthesized PANs easily can be homogeneously blended both in solution and solid states, and the resulting emission is a superposition of the emission of the blend components. This study provides a facile approach to tune the photophysical properties of PANs and related vinyl-based NCLPs and provides new fundamental insight to further booster application development of NCLPs.