Indolophenoxazine Compound for OLED Hole Transport Layer
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Solution Overview
Problem
Phosphorescent light emitting devices face limitations in emission efficiency and driving durability due to materials with deep HOMO levels and low chemical stability, such as compound A with a deep HOMO level and compound B with a carbon-nitrogen bond of low stability.
Innovation Solution
An indolophenoxazine compound with a shallow HOMO level and high chemical stability is developed, represented by a specific general formula, where R1 to R4 represent hydrogen or alkyl groups, and n is an integer from 0 to 3, used as a material for constructing a hole transport layer in organic light emitting devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If compound A with indoloacridine skeleton is used, then deep HOMO level is achieved, but emission efficiency is reduced
Solution Approach 1:
The patent changes the molecular skeleton parameter from indoloacridine to indolophenoxazine, which fundamentally alters the HOMO level characteristics. The indolophenoxazine skeleton inherently provides both shallow HOMO level and high emission efficiency, resolving the contradiction by selecting a different chemical structure with superior dual properties.
Solution Approach 2:
The patent creates a composite molecular structure by combining indole and phenoxazine rings in a specific configuration. This composite structure achieves synergistic effects where the indole moiety contributes to shallow HOMO level while the phenoxazine portion maintains high emission efficiency, thus resolving the contradiction between deep HOMO level and emission efficiency.
2Reliability
If compound B with arylamino group substitution is used, then shallow HOMO level is achieved, but chemical stability deteriorates
Solution Approach 1:
The patent changes the molecular skeleton parameter from indoloacridine to indolophenoxazine, which inherently provides both shallow HOMO level and high emission efficiency, resolving the contradiction by selecting a different chemical structure with superior dual properties.
Solution Approach 2:
The patent extracts the problematic arylamino group substitution and replaces it with the indolophenoxazine skeleton that naturally achieves shallow HOMO level without introducing chemically unstable bonds. This extraction of the unstable component while retaining the desired electrical property resolves the contradiction.
Data Source
Figure 1
AI summary
Provided is an organic light emitting device having high emission efficiency and excellent driving durability. The organic light emitting device includes an anode, a cathode, and an organic compound layer disposed between the anode and the cathode, in which the organic compound layer includes an indolophenoxazine compound represented by the following general formula [1]: (in the formula [1], R1 to R4 each represents one of a hydrogen atom and an alkyl group having 1 to 4 carbon atoms, and n represents an integer of 0 to 3).