Flexible, ultra-stable and color tunable fluorescent films based on all inorganic perovskite quantum dots embedded in polymer

Abstract

Colloidal perovskite CsPbX3 (X = Cl, Br, I) nanocrystals (CPNCs)/polymers composites have attracted extensive attention due to their potential to be developed as flexible phosphor films for lighting applications. However, to maintain high quantum efficiency and photo stability of CPNCs in such composites remains a daunting challenge. Here, we have demonstrated a layered composite structure consisting of CPNCs and polydimethylsiloxane (PDMS) with multi-color emission and long-term stability. By tuning the molar ratio between CsPbCl1.58Br1.42 and CsPbBr1.35I1.65, flexible fluorescent films as down-converter layers with a high luminescent efficiency and a controllable color temperature spanning from 3194 K to 5901 K have been demonstrated. Furthermore, due to embedding inside such composites, the quantum efficiency of CPNCs exhibited negligible changes during seven months in ambient conditions. The carrier dynamics based on time-resolved photoluminescence (PL) and transient absorption spectroscopy reveal that the hot electron tunneling and trapping process are significant in the composite film. This work provides a good understanding of CPNC materials in complex composite for the development of flexible, robust, color controllable fluorescent films for lighting applications.

In Situ Green Preparation of Highly Stable CsPbBr3–Polyimide Films for Flexible Liquid Crystal Displays

“…However, the emission intensity of the bare CsPbBr 3 QDs decreased rapidly with increasing storage time, and emitted little light after only 10 h due to the dissociation of the ligands and the QDs were destroyed. [ 30 ] These results prove that PI can protect CsPbBr 3 QDs from damage by oxygen and humidity in the ambient environment.…”

Full-color micro-LED display with photo-patternable and highly ambient-stable perovskite quantum dot/siloxane composite as color conversion layers

“…For this reason, PQD has recently been attracting attention as a material for CCLs [10][11][12] . PQD CCLs have been implemented using a variety of techniques, including the most prominent options such as spin coating 13 , ink-jet printing 14,15 and vacuum drying 16 . In order to achieve efficient CCLs, the energy of the backlight unit with short wave length located at the bottom of the CCLs, should be absorbed as much as possible for photoconversion without loss.…”