A Room Temperature Route toward In Situ Crystallization of Perovskite Nanocrystals Induced by Acrylic Acid for Flexible Free‐Standing Luminescent Gels

Abstract

Perovskite nanocrystals (PNCs) with unique and excellent optical properties have emerged as appealing luminescent materials in optoelectronic fields. However, high temperature processing, complicated procedures, and the use of toxic solvents are typically involved in the preparation of PNCs and their related optoelectronic devices. In this study, a one‐step method is developed for the preparation of flexible photoluminescence gel based on PNCs at ambient conditions, which is a promising alternative to the current PNCs preparation strategy in terms of experimental friendliness, ease of production, and the potential for flexible devices. Acrylic acid (AA) is used for in situ crystallization of PNCs. The interaction between H+ of AA and perovskite‐solvent complex determines the nucleation and growth of PNCs. This crystallization mechanism is systematically studied by varying acid category, adjusting solvent kind, and regulating the ratio of PNCs and gels. To give a proof of practicability, flexible free‐standing PNCs‐gel composites with excellent luminescent and mechanical properties are prepared with the AA treatment. Moreover, the PNCs‐gel shape can be customized, which greatly expands the structural flexibility and functionalities of fabricated devices.

Cellulose‐Assisted Formation of 2D Hybrid Halide Perovskite Nanocrystals with Enhanced Stability for Light‐Emitting Devices

“…Low levels of the polymer (1-5 wt.% or 0.5-5 mg mL −1 ) enhance the PLQY due to surface defect passivation and improve the PeLEDs in terms of operational stability [37,38] while higher polymer percentages result in higher PeLED efficiencies (EQE). [13,30] In all published works, although the role of the polymer percentage in controlling nucleation and growth of MHPs grains has been suggested [39] the detailed interaction mechanism is not fully understood due to the chemical complexity of the solution containing the MHPs precursors.…”

A Review of Perovskite Nanocrystal Applications in Luminescent Solar Concentrators

“…Moreover, combined with a 3D printing technique, it is able to customize LSCs with a variety of shapes for different applications. [142,149] It is noteworthy that structure optimization is an efficient way to reduce self-absorption loss and thus increase quantum yield. In literature, it is frequently reported that NCs can be optimized into core-shell heterojunction structures to solve the reabsorption problem.…”

Modification strategies of lead halide perovskite nanocrystals for efficient and stable LEDs

“…6,7 With high PL, excellent color purity, and a wide color gamut, PNCs are also highly attractive for high-definition displays. [8][9][10] The PNC-LEDs can fully meet the requirements of the highdefinition luminous displays specified by REC.2020. 11 Moreover, recent breakthroughs have pushed the external quantum efficiency (EQE) of PNC-LEDs to new heights, surpassing 25% for green and red-light LEDs, and exceeding 10% for blue-light LEDs.…”