# Achieving efficient red room-temperature phosphorescence in two-dimensional hybrid halide perovskites by manganese doping

## TL;DR

This paper introduces a method to enhance red room-temperature phosphorescence in 2D perovskites using manganese doping, achieving high efficiency and long lifetimes for potential use in LEDs and other applications.

## Contribution

The study demonstrates a novel approach to significantly improve red RTP efficiency and lifetime in 2D hybrid halide perovskites through manganese ion doping.

## Key findings

- Manganese-doped 2D perovskites achieved a photoluminescence quantum yield of 66.38%, eight times higher than the original material.
- The phosphorescence lifetime was extended to 12 ms, making the material suitable for practical applications.
- Red-emitting LEDs were successfully fabricated using the RTP materials, showing their potential in lighting technology.

## Abstract

Red room-temperature phosphorescence (RTP), characterized by its long emission wavelength and lifetime, has broad applications in various fields, including bioimaging, light-emitting diodes (LEDs), information encryption, and photodetectors. Two-dimensional (2D) hybrid halide perovskites are a novel class of organic-inorganic hybrid composite materials. Their diverse binary combinations offer a versatile platform for designing energy transfer pathway and introducing emerging optical phenomena, making them promising candidates for developing the next-generation of RTP materials. However, currently reported red RTP halide perovskites are scarce and often suffer from low quantum efficiency and short lifetime. Herein, we developed a series of 2D hybrid halide perovskites with efficient red RTP through doping manganese ions and found that the modified materials exhibit a significantly enhanced photoluminescence quantum yield of 66.38%, which is eight times higher than that of the original perovskite host. Moreover, the phosphorescence lifetime can be extended up to 12 ms. In-depth mechanistic investigations reveal that the exceptional luminescent performance originates from efficient energy transfer be-tween the host matrix and manganese ions. Furthermore, red-emitting LEDs have been successfully fabricated with these RTP materials as emitting layers, highlighting the promising applications of 2D hybrid halide perovskites in lighting applications.