Perovskite Light-Emitting Element Blocking Layer Charge Confinement
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Solution Overview
Problem
The existing light-emitting element with a metal halide perovskite layer struggles to confine charges effectively, leading to a reduced luminance lifetime due to charge migration.
Innovation Solution
Incorporating a blocking layer between the electrodes and the light-emitting layer to suppress charge migration, using a perovskite structure for the light-emitting layer and blocking layers with specific materials like PCPPn and CBP to confine electrons and holes within the light-emitting layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a metal halide perovskite light-emitting layer is used, then luminous efficiency is improved, but charge confinement is insufficient leading to reduced luminance lifetime
Solution Approach 1:
A blocking layer is introduced as an intermediary component between the electrode and the perovskite light-emitting layer. This blocking layer acts as a mediator that suppresses charge migration from the light-emitting layer to the electrode, thereby extending luminance lifetime while preserving the high luminous efficiency of the perovskite material.
Solution Approach 2:
The device structure is segmented into distinct functional layers: an electrode, a blocking layer, and a perovskite light-emitting layer. This segmentation allows the blocking layer to specifically address charge confinement without compromising the light-emitting properties of the perovskite layer, resolving the contradiction between efficiency and lifetime.
2Device complexity
If charges are allowed to migrate freely, then device simplicity is maintained, but charge confinement is insufficient reducing luminance lifetime
Solution Approach 1:
The device is divided into functionally distinct layers with the blocking layer serving as a dedicated component for charge management. This segmentation introduces minimal complexity while achieving effective charge confinement and extending luminance lifetime.
Solution Approach 2:
The blocking layer serves as a simple intermediary component that provides charge confinement functionality without requiring complex structures or multiple additional layers, maintaining device simplicity while improving luminance lifetime.
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
This configuration enhances the recombination probability of electrons and holes, thereby improving the luminance lifetime and maintaining high color purity and luminance across various viewing angles.
Implementation Method 1
a blocking layer provided in at least one of a position between the first electrode and the light-emitting layer or a position between the second electrode and the light-emitting layer, and configured to suppress migration of charges from the light-emitting layer
Implementation Method 2
a light-emitting layer provided between the first electrode and the second electrode and including a material having a perovskite structure
Data Source
AI summary
A light-emitting element includes a first electrode, a second electrode, a light-emitting layer provided between the first electrode and the second electrode and including a material having a perovskite structure, and a blocking layer provided in at least one of a position between the first electrode and the light-emitting layer or a position between the second electrode and the light-emitting layer, and configured to suppress migration of charges from the light-emitting layer.