OLED Emissive Compound Structure for Saturated Color Output
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Solution Overview
Problem
Existing organic light emitting diodes (OLEDs) face challenges in achieving saturated red, green, and blue pixel emissions required for full color displays, and conventional methods for producing white light often rely on complex stack structures or absorption filters, which can be inefficient.
Innovation Solution
The development of a compound (LA)M(LB) with a specific structure of Formula I, comprising Pd or Pt, monocyclic or polycyclic rings, and various substituents, which can be used in an OLED's organic layer to enhance color emission, potentially replacing complex stack structures and improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional stack structures or absorption filters are used to produce saturated colors in OLEDs, then color emission can be achieved, but device complexity increases and efficiency decreases
Solution Approach 1:
The patent combines multiple color emission functions into a single emissive layer by using a white light emitting core compound with multiple emission centers. This merges the functionality of what would traditionally require separate red, green, and blue emissive layers or complex stack structures into one integrated layer, thereby reducing device complexity while maintaining color emission capability
Solution Approach 2:
The white light emitting core compound serves multiple functions simultaneously: it acts as the host material, contains multiple emission centers for different colors, and provides the structural framework for the entire emissive layer. This multi-functionality eliminates the need for separate components and simplifies the overall device structure
2Ease of manufacture
If conventional stack structures or absorption filters are used to produce saturated colors in OLEDs, then color emission can be achieved, but manufacturing efficiency decreases
Solution Approach 1:
The patent combines multiple color emission functions into a single emissive layer by using a white light emitting core compound with multiple emission centers. This merges the functionality of what would traditionally require separate red, green, and blue emissive layers or complex stack structures into one integrated layer, thereby reducing device complexity while maintaining color emission capability
Solution Approach 2:
The patent modifies the chemical composition and structural parameters of the emissive layer by incorporating specific core compounds with defined molecular structures and emission characteristics. This allows tuning of color output and emission properties through chemical parameter optimization rather than complex structural arrangements
3Device complexity
If a single emissive layer is used to emit white light, then device simplicity is improved, but color saturation is reduced
Solution Approach 1:
The patent applies local quality by incorporating multiple distinct emission centers within the single emissive layer, each responsible for specific color wavelengths. This allows different regions of the emission spectrum to be generated by specific molecular centers within the same layer, achieving color saturation without requiring multiple layers
Solution Approach 2:
The emissive layer uses a composite material system consisting of a white light emitting core compound that integrates multiple emission centers. This composite approach within a single layer enables the material to emit multiple saturated colors simultaneously, achieving both structural simplicity and color purity
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 (LA)M(LB) enables improved color purity and efficiency in OLEDs by directly emitting saturated colors or modifying emissions through a single emissive layer, reducing complexity and enhancing display performance.
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 (LA)M(LB) having a structure of Formula Iis provided. In Formula I, each of moiety A and moiety B is a monocyclic ring or a polycyclic fused ring system, moiety B is a polycyclic fused ring system and subject to the provisos that: i) if each RC is H, one of X1, X4, and X7 is N, and the remaining ones of X1 to X8 are C, then at least one RD attached to X5 to X7 is not H; or ii) if each of X1 to X8 is C, then at least one of the following is true: (1) at least one RD attached to X5 or X7 is not H, or (2) at least one RC is not H. Formulations, OLEDs and consumer products containing the compound are also provided.