Laser Emission from Self-Assembled Colloidal Crystals of Conjugated Polymer Particles in a Metal-Halide Perovskite Matrix

Abstract

Here, we present a hybrid organic/inorganic photonic composite, which generates laser emission from the organic material after pumping the inorganic component. The composite consists of a methylammonium lead-halide perovskite matrix CH 3 NH 3 Pb(Br x Cl (1−x) ) 3 and monodisperse poly(fluorene-co-divinylbenzene) particles, which have excellent optical feedback and gain. Micrometer-sized conjugated polymer particles (CPPs) are deposited together with the perovskite precursor from solution using a single-step vertical deposition method. The particles self-assemble into a photonic crystal and the perovskite forms an inorganic matrix in the interstitial space. Energy transfer to the polymer particles after optically pumping the metal-halide perovskite is studied in two systems with different halide ratios in the perovskite (Br to Cl: 1/9 and 4/6) to control the overlap of the perovskite emission energy with the absorption of the particles. From time-resolved photoluminescence experiments, we observe nonradiative energy transfer from the perovskite to the particle in both coassemblies; however, increased spectral overlap of perovskite emission and particle absorption enhances energy transfer efficiency by 37%. Because of the ordered assembly of the CPPs, we observe laser emission after energy transfer from the Cl-rich perovskite matrix at fluences of 13 mJ/cm 2 . Our report of a hybrid material system that combines the excellent optoelectronic properties of metal-halide perovskites with the outstanding optical properties of conjugated polymers represents a new approach and progress in the pursuit of electrically pumped polymer lasers.

Room Temperature Synthesis of Stable Zirconia‐Coated CsPbBr3 Nanocrystals for White Light‐Emitting Diodes and Visible Light Communication

“…Among these methods, the coating technique is an effective method to enhance the optical performance and stability of NCs, which is due to their transparent characteristic, low cost, and the stability of coating components. Polymers, [ 34–40 ] metal‐organic frameworks [ 41,42 ] and inorganic shells [ 43–46 ] have been reported to improve the optical performance and stability of NCs. However, the coating techniques for NCs are found to lead to the uncontrolled morphologies and sizes.…”

Directing Random Lasing Emission Using Cavity Exciton-Polaritons

“…directly from polycrystalline and nanocrystals thin films. This has indeed been demonstrated in iodine-based perovskites [27][28][29][30][31], chloride-based perovskites [32] and bromide-based perovskites [32][33][34][35][36][37][38][39][40][41][42][43][44][45].…”

A Direct Mapping Approach to Understand Carrier Relaxation Dynamics in Varied Regions of a Polycrystalline Perovskite Film

“…Organo‐inorganic halide perovskites have attracted much attention owing to their successful applications not only for photovoltaics, but also for other potential optoelectronic applications . However, fundamental understanding of the operational mechanism for a perovskite solar cell (PSC) has not been well recognized.…”