Perovskite Thin Film for OLED Color Gamut
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Solution Overview
Problem
Organic light-emitting display apparatuses face limitations in achieving a wide color gamut, which is essential for high-quality display performance, particularly in portable electronic devices and televisions.
Innovation Solution
Incorporating a thin film comprising a perovskite compound represented by Formula 1, [A][B1nB2(1-n)]X3, on an organic light-emitting device, where A is a monovalent organic- or inorganic-cation, B1 and B2 are divalent inorganic-cations, and X is a monovalent anion, positioned in the traveling direction of light emitted from the device, enhancing light emission efficiency and color purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional organic light-emitting device structure is used, then the device can be driven with low voltage and have reduced thickness, but the color gamut is limited and display quality is insufficient
Solution Approach 1:
The patent uses a composite structure combining organic light-emitting materials with perovskite quantum dot materials. The organic layer provides low-voltage operation characteristics while the perovskite quantum dots enhance color gamut through quantum confinement effects, achieving both low voltage operation and wide color gamut simultaneously
Solution Approach 2:
The patent introduces perovskite quantum dots specifically in the emission layer region to enhance color properties locally, while maintaining the organic light-emitting structure in other regions for low-voltage operation. This localized enhancement of color gamut in critical areas resolves the contradiction between ease of manufacture and manufacturing precision
2Device complexity
If conventional organic emission layers are used, then the device structure can be simplified, but color purity and light emission efficiency are insufficient
Solution Approach 1:
The patent changes the physical and chemical parameters of the emission layer by incorporating perovskite quantum dots with controlled size (2-10 nm). The quantum dot size parameter directly controls emission wavelength and color purity through quantum confinement effects, achieving high color purity while maintaining relatively simple device structure
Solution Approach 2:
The perovskite quantum dots act as an intermediary material between the organic light-emitting layers. They receive excitons from the organic materials and convert them to photons with enhanced color purity, serving as a mediator that improves light emission efficiency without significantly complicating the overall device structure
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 perovskite compound increases the color gamut of the organic light-emitting display apparatus, providing high color purity and efficient light emission, thereby improving display quality and meeting the requirements for modern electronic devices.
Implementation Method 1
a thin film comprising at least one perovskite compound represented by Formula 1 disposed on the organic light-emitting device. The thin film may be positioned in a traveling direction of light emitted from the organic light-emitting device
Implementation Method 2
Excitons produced by recombining electrons with holes in the organic emission layer may transition from an excited state to a ground state, thus generating light
Data Source
AI summary
Provided is an organic light-emitting display apparatus. The organic light-emitting display apparatus includes a first substrate; an organic light-emitting device disposed on the first substrate; and a thin film comprising at least one perovskite compound represented by Formula 1 disposed on the organic light-emitting device. T the thin film is positioned in a traveling direction of light emitted from the organic light-emitting device:[A][B1nB2(1-n)][X]3 <Formula 1>A is at least one monovalent organic-cation, at least one monovalent inorganic-cation, or a combination thereof. B1 and B2 are each independently at least one divalent inorganic-cation. n is a real number satisfying 0<n≤1. X is at least one monovalent anion.