Ir(III) and Pt(II) Complexes for Saturated OLED Emission
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Solution Overview
Problem
Current organic light-emitting diode (OLED) technologies face challenges in achieving efficient and saturated color emission, particularly in red, green, and blue pixels, which are essential for full-color displays, due to limitations in the performance of conventional materials.
Innovation Solution
Development of novel Ir(III) and Pt(II) complexes with organic ligands, specifically substituted with trialkylsilylmethyl, trialkylsilylethyl, trialkylgermylmethyl, or trialkylgermylethyl groups, which improve emitter efficiency and facilitate sublimation, enabling the creation of OLEDs with enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional organic materials are used in OLEDs, then device fabrication is simpler, but emission efficiency and color saturation are insufficient
Solution Approach 1:
The patent modifies the molecular structure of organic emitter materials by incorporating specific heterocyclic rings and substituent groups (e.g., triphenylene, pyridine, carboxylic acid groups) to optimize photophysical properties. These parameter changes in molecular structure directly improve emission efficiency and color saturation while maintaining compatibility with existing OLED fabrication processes
Solution Approach 2:
The patent develops composite organic materials combining multiple functional moieties within single emitter molecules. These composite structures integrate light-harvesting units, emitting units, and stabilizing groups to achieve both high emission efficiency and saturated colors, resolving the contradiction between material performance and fabrication simplicity
2Quantity of substance
If conventional organic materials are used in OLEDs, then material cost is lower, but color emission performance is insufficient
Solution Approach 1:
The patent introduces specific functional groups and substituent patterns at localized positions within the organic emitter molecules. These local structural modifications (e.g., positions of carboxylic acid groups, heteroatom placement) precisely control emission wavelength and color purity, achieving saturated red, green, and blue emissions without requiring expensive bulk material changes
Solution Approach 2:
The patent divides the organic emitter into distinct functional segments: chromophoric units for color determination, auxochromic units for efficiency enhancement, and anchoring groups for device integration. This segmentation allows independent optimization of each segment to achieve both cost-effectiveness and superior color emission performance
3Device complexity
If white OLED structure with absorption filters is used, then device structure is simpler, but emission efficiency is reduced
Solution Approach 1:
Instead of using a white light source with absorption filters to produce colored emission, the patent inverts the approach by using separate organic emitter materials that directly emit saturated red, green, and blue light. This eliminates the need for absorption filters and reduces energy loss while maintaining relatively simple device structure
Solution Approach 2:
The patent develops organic emitter materials that can function as both the light source and the color-defining element simultaneously. Each emitter material performs multiple functions: absorbing electrical energy, generating excitons, and emitting light at specific wavelengths, thereby eliminating the need for separate filter components and improving overall emission efficiency
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 introduction of these complexes leads to improved efficiency and performance in OLEDs, enabling the production of OLEDs with better color emission characteristics, particularly in red, green, and blue pixels, enhancing their suitability for full-color displays.
Implementation Method 1
OLEDs make use of thin organic films that emit light when voltage is applied across the device
Implementation Method 2
Introduction of such a group in the complex can improve efficiency of the emitters and facilitate sublimation
Data Source
AI summary
A compound having a formula of M(LA)p(LB)q(LC)r, where LA has a structure of Formula I,LB is a bidentate ligand; and LC has a structure of Formula II,is provided. In Formula I and Formula II, the compound can be homoleptic or heteroleptic and can include up to three different ligands; K3 and K4 are each independently a direct bond, O, or S; each of moiety A and moiety B represents a monocyclic ring or a polycyclic, fused-ring structure; each of Z1 and Z2 is C or N; and at least one of RA, RB, RC1, RC2, or RC3 comprises a structure of Formula III,In Formula III, L is bivalent organic linker, and Z is Si or Ge. Each RA, RB, RC1, RC2, and RC3 is independently hydrogen or a General Substituent, and each of R1, R2, and R3 is a General Substituent. Formulations, OLEDs, and consumer products including such compounds are also provided.