Iridium OLED Emitter Composition for Saturated Solution-Processed Colors
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Solution Overview
Problem
Existing OLEDs face challenges in achieving efficient and cost-effective production of saturated colors, particularly in flexible displays, due to limitations in emissive materials that can be processed in solution and maintain high performance.
Innovation Solution
Development of a compound with the formula Ir(LA)n(LB)3-n, which can be processed in solution and incorporated into OLEDs, enhancing color saturation and efficiency through its structure and functional layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional phosphorescent emissive molecules are used to achieve saturated colors in OLEDs, then color saturation is improved, but manufacturing cost and processing complexity increase due to limitations in solution processing
Solution Approach 1:
The patent modifies the chemical structure of phosphorescent emitters by introducing specific ligand combinations (LA and LB ligands with particular donor atoms and substituents) to achieve both saturated color emission and solution processability. The structural parameters of the emitter molecules are changed to enable compatibility with solution-based manufacturing while maintaining high color purity
Solution Approach 2:
The patent employs composite emissive layer formulations combining the new Ir(LA)n(LB)3-n compounds with host materials and dopants in specific ratios. This composite approach enables solution processing while achieving the required color saturation and efficiency performance
2Illumination intensity
If existing OLED materials are used, then device functionality is achieved, but color purity and emission efficiency are insufficient for high-performance flexible displays
Solution Approach 1:
The patent optimizes specific local regions of the emissive layer by controlling the distribution and concentration of Ir(LA)n(LB)3-n emitter molecules within the host matrix. This local optimization ensures consistent color purity and emission efficiency across the entire flexible display device
Solution Approach 2:
The patent introduces host materials and dopants as intermediary substances that mediate between the emitter molecules and the device structure. These intermediaries facilitate energy transfer, stabilize emission characteristics, and ensure performance consistency across flexible substrates
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 compound enables the production of OLEDs with improved color purity and efficiency, suitable for flexible displays and various consumer products, including lighting panels and electronic components.
Implementation Method 1
One application for phosphorescent emissive molecules is a full color display
Implementation Method 2
OLEDs make use of thin organic films that emit light when voltage is applied across the device
Data Source
AI summary
A compound having the formula Ir(LA)n(LB)3-m, having the structureof Formula I is provided. In the structure of Formula I, each of A1 through A8 is independently carbon or nitrogen; at least one of A1 through A8 is nitrogen; ring B is bonded to ring A through a C—C bond; the iridium is bonded to ring A through an Ir—C bond; X is O, S, or Se; each of R1 through R5 are independently selected from a variety of substituents, which may be linked for form a ring; n is an integer from 1 to 3; and at least one R2 adjacent to ring C is not hydrogen. Formulations and devices, such as OLEDs, that include the first compound are also provided.