Organometallic OLED Emitters for Saturated Color Emission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current organic light-emitting diode (OLED) technologies face challenges in achieving saturated colors for full-color displays, particularly in red, green, and blue emissions, which are essential for industry standards, and existing materials may not efficiently meet the requirements for performance and flexibility.
Innovation Solution
A compound with a specific structure of Formula I, comprising Pt or Pd, 5- or 6-membered carbocyclic or heterocyclic rings, and specific ligands, is used in the organic layer of OLEDs to enhance color emission properties, allowing for the production of saturated colors and flexible substrate applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional organic materials are used in OLEDs, then cost advantages and flexibility are achieved, but saturated color emission for full-color displays cannot be achieved
Solution Approach 1:
The patent modifies the chemical structure of organic emitter molecules by introducing specific heterocyclic rings with nitrogen atoms and coordinating metal centers (Ir, Pt, Pd) with defined ligand configurations. These parameter changes in molecular structure enable the materials to emit saturated red, green, and blue colors while maintaining the flexibility and cost advantages of organic materials.
Solution Approach 2:
The invention creates composite organometallic compounds combining organic ligands (such as cyclometalating ligands and ancillary ligands) with metal centers (Ir, Pt, Pd). This composite structure integrates the benefits of organic materials (flexibility, cost) with the photophysical properties of metal complexes (saturated color emission, high quantum efficiency), resolving the contradiction between color saturation and performance consistency.
2Illumination intensity
If white OLED with absorption filters is used, then saturated colors can be achieved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent extracts the color filtering function from separate absorption filter layers and integrates it directly into the emissive layer through the use of organometallic compounds that emit saturated colors intrinsically. This eliminates the need for additional filter layers, reducing device complexity while maintaining saturated color emission.
Solution Approach 2:
The invention merges the functions of color emission and color filtering into a single emissive layer containing organometallic compounds. Instead of having separate emissive layers and absorption filters, the patent combines these functions by designing molecules that directly emit the desired saturated colors, thereby simplifying the overall device structure.
3Illumination intensity
If existing organic emitter materials are used, then flexibility and cost advantages are maintained, but emission efficiency and color purity are insufficient
Solution Approach 1:
The patent optimizes the molecular parameters of organic emitters by incorporating specific heterocyclic rings (5-membered or 6-membered with nitrogen at positions Z1-Z3) and coordinating metal centers with defined ligand environments. These parameter changes enhance emission efficiency and color purity while maintaining compatibility with existing manufacturing processes for organic optoelectronic devices.
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 emission characteristics, meeting industry standards for saturated red, green, and blue emissions, and allows for flexible substrate fabrication, enhancing the performance and versatility of OLED devices.
Implementation Method 1
OLEDs make use of thin organic films that emit light when voltage is applied across the device
Implementation Method 2
One application for phosphorescent emissive molecules is a full color display
Data Source
AI summary
A compound having a structure of Formula I,is provided. In Formula I, M is Pt or Pd; rings A, B, C, and D are 5-membered or 6-membered rings; one of Z1, Z2, and Z3 is N and the other two are C; each of X1 to X10 is C or N; K is a direct bond, O, S, N(Rα), P(Rα), B(Rα), C(Rα)(Rβ), or Si(Rα)(Rβ); each of L1 and L2 is a direct bond or a linker; each R, R′, R″, Rα, Rβ, RA, RB, RC, RD, and RE is hydrogen or a General Substituent; R1 is a substituent; at least one RE comprises a substituent selected from the group consisting of aryl, heteroaryl, cycloalkyl, and heteroalkyl; any two substituents may be joined or fused to form a ring, except that RE at X3 or X4 cannot be joined with RA to from a ring. Formulations, OLEDs, and consumer products including the compound are also provided.