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Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation

Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation

Published on: October 1, 2019

Lead Halide Post-Perovskite-Type Chains for High-Efficiency White-Light Emission.

Romain Gautier¹, Florian Massuyeau¹, Gabin Galnon¹

¹Institut des Matériaux Jean Rouxel (IMN), Université de Nantes, CNRS, 2 rue de la Houssinière, BP 32229, 44322, Nantes cedex 3, France.

Advanced Materials (Deerfield Beach, Fla.)

|February 19, 2019

Summary

Researchers enhanced white light emission from hybrid metal halides by discovering post-perovskite chains. This breakthrough significantly boosts photoluminescence quantum yield (PLQY) for advanced solid-state lighting applications.

Keywords:

photoluminescence post-perovskite solid-state lighting trapped excitons

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Area of Science:

Materials Science
Solid-State Chemistry
Photophysics

Background:

Hybrid metal halides with perovskite structures show promise for solar cells and LEDs due to tunable optical properties.
These materials are of interest for solid-state lighting due to high color rendering, thermal stability, and solution processability.
Existing white photoluminescence quantum yields (PLQY) are low (0.5-9%), limiting their application.

Purpose of the Study:

To investigate methods for enhancing the quantum efficiencies of white light emission in hybrid metal halides.
To explore the role of structural polymorphism in influencing photoluminescence properties.
To identify novel hybrid lead halide materials with improved light-emitting characteristics.

Main Methods:

Synthesis of hybrid lead halides using different piperazine organic cations.
Structural characterization to identify perovskite layers versus post-perovskite chains.
Photoluminescence quantum yield (PLQY) measurements to quantify emission efficiency.

Main Results:

A polymorph containing [PbX4]2- post-perovskite-type chains achieved a significantly enhanced PLQY of 45%.
The presence of perovskite layers versus post-perovskite chains strongly influences self-trapped exciton states.
Different piperazines dictate the formation of either perovskite layers or post-perovskite chains in the hybrid material.

Conclusions:

Hybrid metal halides incorporating post-perovskite-type chains offer a pathway to dramatically increase white photoluminescence efficiency.
Structural control via organic cation choice is key to stabilizing excitons and enhancing light emission.
This class of materials holds potential for improving properties reliant on stabilized trapped excitons.