Pd/Pt OLED Emitters for Saturated Color in Simpler Architectures
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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 white light emission often require complex stack structures or absorption filters.
Innovation Solution
Development of organometallic compounds, specifically those following Formula I, which can be used in OLEDs to enhance emission properties, including the formation of heterocyclic rings and specific substituents to improve color purity and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional methods are used to achieve saturated red, green, and blue pixel emissions, then color saturation can be achieved, but device complexity increases due to requiring complex stack structures or absorption filters
Solution Approach 1:
The patent combines multiple emissive functionalities into a single organic layer by incorporating a heteroleptic iridium complex that can emit multiple colors (red, green, blue) simultaneously. This merging approach eliminates the need for separate stack structures or absorption filters for each color, thereby achieving saturated colors while reducing device complexity
Solution Approach 2:
The iridium complex serves multiple functions within a single compound: it acts as both the emissive material and the color-defining element. The complex can be tuned to emit different colors by modifying ligands, providing universal applicability for generating saturated red, green, and blue emissions without requiring different structural configurations
2Illumination intensity
If conventional methods are used for white light emission in OLEDs, then white light can be produced, but device complexity increases due to requiring complex stack structures or absorption filters
Solution Approach 1:
The patent merges the functions of multiple emissive layers into a single layer containing an iridium complex that can produce white light emission. This approach combines what would traditionally require separate red, green, and blue emissive layers into one unified structure, eliminating the need for additional absorption filters and simplifying the overall device architecture
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 organometallic compounds enable improved color purity and efficiency in OLEDs, facilitating the production of saturated colors without the need for complex stack structures or absorption filters, thereby simplifying the manufacturing process.
Implementation Method 1
OLEDs make use of thin organic films that emit light when voltage is applied across the device
Data Source
AI summary
Compounds of Formula I,are provided. In Formula I, M is Pd or Pt; each of X1 to X14 is C or N; one of Z1 and Z2 is C and the other is N; Y is selected from O, S, Se, N*R, CRR′, SiRR′, or GeRR′; K1 is a direct bond, O, or S; each R, R′, RA, RB, RC, and RD is independently hydrogen or a substituent; at least one of R, R′, RA, RB, RC, or RD is a substituent R*; and (i) R* comprises a 5-membered or 6-membered heterocyclic ring, or (ii) R* comprises Formula Ia:Formula Ia;wherein each of RY and RZ independently represents mono to the maximum allowable substitution, or no substitution;R1, R2, R3, R4, RY and RZ is independently hydrogen or a substituent selected from the group consisting of deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, germyl, boryl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, boryl, selenyl, and combinations thereof;wherein at least one of R1, R2, R3, and R4 is not hydrogen. Formulations, OLEDs, and consumer products including the compound are also provided.