1D Hybrid Post-Perovskites for High-PLQY White-Light Emission
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Solution Overview
Problem
Low photoluminescence quantum yields (PLQY) in hybrid perovskites limit their efficiency for applications in solar cells and solid-state lighting, with no effective approach to enhance broadband white-light emission.
Innovation Solution
Development of one-dimensional (1D) hybrid post-perovskites with a specific formula AaMmXx,yH2O, where A is a cis- or trans-2,5-dialkylpiperazine derivative, M is a metal, and X is a halogen, exhibiting a ladder structure with corner- and edge-sharing octahedra, which significantly increases PLQY to ≥10%, ≥20%, or ≥45%.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If hybrid perovskites are used for solid-state lighting applications, then broadband white-light emission is achieved, but photoluminescence quantum yields remain low (0.5%-9%)
Solution Approach 1:
The patent changes the structural parameters of hybrid perovskites by reducing dimensionality from 2D to 1D post-perovskite structures and modifying the organic cation to cis- or trans-2,5-dialkylpiperazine derivatives. These parameter changes result in enhanced photoluminescence quantum yields (≥45%) while maintaining broadband white-light emission, directly resolving the contradiction between illumination intensity and energy loss.
2Adaptability or versatility
If dimensionality is decreased in hybrid perovskites, then quantum confinement effects enhance optoelectronic properties, but photoluminescence quantum yields remain insufficient for high efficiency applications
Solution Approach 1:
The patent creates composite hybrid post-perovskite materials combining specific organic cations (cis- or trans-2,5-dialkylpiperazine derivatives) with metal halide inorganic frameworks. This composite structure with 1D ladder configuration achieves both tunable optoelectronic properties through quantum confinement and high reliability with PLQY ≥45%, resolving the contradiction between adaptability and reliability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The 1D hybrid post-perovskites demonstrate enhanced photoluminescence quantum yields and stability, enabling superior broadband white-light emission and improved optoelectronic properties, suitable for advanced lighting and energy applications.
Implementation Method 1
the photoluminescence quantum yields can be greatly increased by changing those for one dimensional (1D) hybrid post-perovskite
Data Source
AI summary
The present invention relates to a new type of low-dimensional hybrid post-perovskites for high efficiency white light emission. More precisely, the invention relates to a one dimensional post-perovskite of formula AaMmXx·yH2O wherein A is a cis- or trans-2,5-dialkylpiperazine derivative bearing C1-C3 linear or branched alkyl groups, M is one or more metal, X one or more halogen, 0<a<5, 1<m<2, 2<x<12, 0<y. The invention also relates to material and luminescent device comprising the same and methods of preparation of the of low-dimensional hybrid post-perovskites.