Homogeneous Freestanding Luminescent Perovskite Organogel with Superior Water Stability
Abstract
Metal‐halide perovskites have become appealing materials for optoelectronic devices. While the fast advancing stretchable/wearable devices require stability, flexibility and scalability, current perovskites suffer from ambient‐environmental instability and incompatible mechanical properties. Recently perovskite−polymer composites have shown improved in‐air stability with the protection of polymers. However, their stability remains unsatisfactory in water or high‐humidity environment. These methods also suffer from limited processability with low yield (2D film or beads) and high fabrication cost (high temperature, air/moisture‐free conditions), thereby limiting their device integration and broader applications. Herein, by combining facile photo‐polymerization with room‐temperature in‐situ perovskite reprecipitation at low energy cost, a one‐step scalable method is developed to produce freestanding highly‐stable luminescent organogels, within which CH3NH3PbBr3 nanoparticles are homogeneously distributed. The perovskite‐organogels present a record‐high stability at different pH and temperatures, maintaining their high quantum yields for > 110 days immersing in water. This paradigm is universally applicable to broad choices of polymers, hence casting these emerging luminescent materials to a wide range of mechanical properties tunable from rigid to elastic. With intrinsically ultra‐stretchable photoluminescent organogels, flexible phosphorous layers were demonstrated with > 950% elongation. Rigid perovskite gels, on the other hand, permitted the deployment of 3D‐printing technology to fabricate arbitrary 2D/3D luminescent architectures.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jul 28, 2019
- Source ID
- 10.1002/adma.201902928
Entities
People
- Dong Wu
- Jingjing Xue
- Mark S. Goorsky
- Michael Liao
- Qibing Pei
- Ximin He
- Yu Qiu
- Yucheng Zhang
- Yusen Zhao
Organizations
- Air Force Office of Scientific Research
- California NanoSystems Institute
- National Science Foundation
- Office of Naval Research
- University of California