Iridium OLED Emitter Composition for Saturated Color and White Light
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Solution Overview
Problem
Conventional OLEDs face challenges in achieving saturated red, green, and blue pixel emissions required for full color displays, and there is a need for improved organic materials that can efficiently produce white light for backlighting applications.
Innovation Solution
The development of a compound of formula Ir(LA)x(LB)y(LC)z, where each of x and y is independently 1 or 2, z is 0 or 1, and x+y+z=3, with specific ligands LA, LB, and LC structures, which are used in an OLED to enhance light emission properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional OLED materials are used, then device fabrication is simpler, but saturated color emission and white light efficiency cannot be achieved
Solution Approach 1:
The patent modifies the chemical structure parameters of organic compounds by introducing specific heteroatoms (B, P, Si, Ge) and functional groups to achieve precise control over emission color and efficiency, resolving the contradiction between color accuracy and material simplicity
Solution Approach 2:
The invention uses composite ligand structures combining multiple elements (B, P, Si, Ge with organic groups) to create materials that simultaneously achieve saturated color emission and high white light efficiency without requiring complex device architectures
2Loss of energy
If white light emission is achieved through conventional materials, then device structure is simpler, but light emission efficiency is insufficient
Solution Approach 1:
The patent optimizes molecular parameters including heteroatom selection, substituent groups, and ligand configuration to maximize quantum efficiency and minimize energy loss in white light emission, achieving high efficiency without complex device structures
Solution Approach 2:
The invention introduces specific functional groups and heteroatoms at strategic positions within the molecular structure to enhance local emission properties, resulting in overall improved white light efficiency while maintaining reasonable structural complexity
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 saturated colors and efficient white light emission, meeting industry standards for display technology and improving the performance of OLEDs.
Implementation Method 1
OLEDs make use of thin organic films that emit light when voltage is applied across the device
Data Source
AI summary
Provided is a compound of formula Ir(LA)x(LB)y(LC)z, where LA comprises Formula I,LB comprises Formula II,LC is a bidentate ligand; and at least one R comprises Formula III,In these structures, each of moieties A, C, and D is a ring or a fused ring system; each of X1 to X13 and Z1 to Z6 is C or N; Y1 is a linking group; each of K, K′, LA, L′, and L″ is a direct bond or a linking group; each substituent is hydrogen or a General Substituent. In addition, at least two RG are not H or D, and one has ≥2 carbon atoms, and (1) a third one of X9 to X13 is C and the RG attached thereto comprises an electron-withdrawing group other than F; or (2) L″ comprises a heterocyclic ring. Formulations, OLEDs, and consumer products containing the compound are also provided.