Metal-Carbene OLED Compounds for Saturated Color Emission
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Solution Overview
Problem
Current organic light-emitting diode (OLED) technologies face challenges in achieving saturated color emission, particularly in red, green, and blue pixels, which is crucial for full-color displays, and there is a need for materials that enhance device lifetime and efficiency.
Innovation Solution
A compound with the formula M(LA)(LB) is introduced, where M is Pt or Pd, and LA and LB are ligands comprising specific monocyclic or polycyclic ring systems, forming a metal-carbene bond, which is used in the organic layer of OLEDs to improve color emission and device stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional organic materials are used in OLEDs, then device flexibility and cost advantages are achieved, but emission saturation and color purity are insufficient
Solution Approach 1:
The patent modifies the chemical structure of organic compounds by introducing specific functional groups and molecular arrangements to change emission parameters. The compounds are designed with particular HOMO-LUMO energy gaps and molecular geometries to achieve saturated color emission while maintaining device stability, directly addressing the contradiction between color saturation and emission stability
Solution Approach 2:
The invention employs composite organic materials with specific molecular compositions and structural features. These composite structures combine electron-donating and electron-withdrawing groups to create materials that simultaneously achieve high color saturation and stable emission characteristics, resolving the technical contradiction
2Adaptability or versatility
If white OLED with absorption filters is used, then full color display is achieved, but device complexity and efficiency are reduced
Solution Approach 1:
The patent divides the emission function into separate red, green, and blue emitting layers, each containing specifically designed organic compounds. This segmentation allows each layer to emit its designated color directly without requiring absorption filters, achieving full-color display capability while simplifying the overall device structure
Solution Approach 2:
Instead of using a white light source with absorption filters to produce colors (conventional approach), the patent inverts the approach by using separate emissive layers that directly generate saturated red, green, and blue colors. This inversion eliminates the need for complex filtering systems while maintaining full-color display capability
3Duration of action of stationary object
If conventional OLED materials are used, then fabrication on flexible substrates is enabled, but device lifetime and efficiency are limited
Solution Approach 1:
The patent optimizes molecular parameters of organic compounds including HOMO-LUMO energy gaps, molecular weights, and structural configurations to simultaneously improve device lifetime and emission efficiency. Specific functional groups are introduced to enhance material stability and charge transport properties, addressing both parameters concurrently
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 enhances the emission efficiency and stability of OLEDs, particularly in achieving saturated colors, thereby improving the performance and longevity of OLED devices.
Implementation Method 1
OLEDs make use of thin organic films that emit light when voltage is applied across the device
Data Source
AI summary
A compound having a structure of Formula I,and a structure of Formula II,fused directly or indirectly to one of moiety A, B, C, or D is provided. In Formulae I and II, each of moieties A, B, C, and D is a monocyclic ring or a polycyclic fused ring system; one of Z1, Z2, and Z3 is N and the other two are C; each of L1, L2, and L3 is a direct bond or a linker; K1 is a direct bond, O, or S; M is Pt or Pd; represents a single bond or a double bond; each of X1 to X6 is C or N; each of Q1, Q2, and Q3 is CRQ or CRQRQ′; n is 1 to 5; and each R, R′, RA, RB, RC, RD, RF, RQ, and RQ′ is hydrogen or a General Substituent. Formulations, OLEDs, and consumer products containing the compound are also provided.