Organic Donor–Acceptor Emitter Compounds for Tunable OLED Color
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing organic light-emitting diodes (OLEDs) face challenges in achieving efficient and tunable emission of saturated colors, particularly in flexible and cost-effective displays, due to limitations in materials and layer configurations.
Innovation Solution
Development of a compound with a specific structure (Formula I) that includes electron donor and acceptor substituents, allowing for the formation of a ring, which is incorporated into an organic layer of the OLED, enhancing the emission efficiency and color tunability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional OLED materials are used, then the device structure is relatively simple, but the emission efficiency and color tunability are insufficient
Solution Approach 1:
The patent employs composite materials by combining the compound of Formula I (containing electron donor and acceptor substituents) with host materials and dopants in the organic emissive layer. This composite approach enables simultaneous achievement of high emission efficiency through triplet state harvesting and tunable color emission, while maintaining a relatively simple overall device structure without requiring additional complex layers
2Ease of manufacture
If conventional OLED materials are used, then the device structure is relatively simple, but the color tunability is limited
Solution Approach 1:
The patent applies local quality by incorporating electron donor and acceptor substituents at specific positions on the aromatic core of the compound of Formula I. This localized functional group placement enables precise control over emission color and characteristics, allowing the same base structure to be adapted for different color emissions (red, green, blue) while maintaining overall device structural simplicity
Solution Approach 2:
The patent utilizes parameter changes by modifying molecular structure parameters (substituent types, positions, and combinations in Formula I) to tune emission properties. By changing chemical composition parameters rather than device architecture parameters, the patent achieves broad color tunability across the visible spectrum while keeping the OLED device structure relatively simple and cost-effective
3Illumination intensity
If saturated color emission is achieved using conventional materials, then the emission intensity is sufficient, but the emission efficiency is reduced
Solution Approach 1:
The patent applies self-service by designing the compound of Formula I to inherently possess both high quantum yield and saturated emission characteristics through its molecular structure. The electron donor-acceptor substituted aromatic core structure enables the compound to efficiently harvest triplets and emit saturated colors simultaneously, eliminating the need for additional efficiency-enhancing layers or complex device configurations
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 improves the emission efficiency and color tunability of OLEDs, enabling the production of flexible and cost-effective displays with improved 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 having a structure of Formula I,is provided. In Formula I, Z1 to Z16 are each CR or N; three consecutive ones of Z1 to Z16 within the same ring cannot be N; each R is independently a hydrogen or a substituent selected from a variety of substituents; at least one R includes and electron donor substituent; at least one R includes an electron acceptor substituent; and any two Rs on the same ring can be joined or fused together to form a ring. Organic light emitting devices, consumer products, formulations, and chemical structures containing the compounds are also disclosed.