Fused Cyclic OLED Emitter for Blue Efficiency and Lifespan
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Solution Overview
Problem
Existing organic light-emitting devices (OLEDs) face challenges in achieving high emission efficiency and a long lifespan, particularly in producing blue light.
Innovation Solution
Incorporating a fused cyclic compound represented by Formula 1 into the emission layer of the OLEDs, which includes a hole transport region and an electron transport region, to enhance emission efficiency and lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional organic light-emitting materials are used in the emission layer, then the device structure can be maintained, but the emission efficiency and lifespan are insufficient
Solution Approach 1:
The patent changes the chemical structure parameters of the emitting material by using a fused cyclic compound with specific ring structures (A1-A4 being benzene, naphthalene, anthracene, fluoranthene, triphenylene, pyrene, chrysene, or perylene groups) and substituents (R1-R5, R21-R23) to simultaneously improve emission efficiency and lifespan of the OLED
Solution Approach 2:
The patent employs a composite material system where the fused cyclic compound is combined with a host material in the emission layer, with the dopant concentration controlled at 1-50 wt% to achieve both high emission efficiency and extended device lifespan
2Ease of manufacture
If conventional emitting materials are used, then material selection is simple, but achieving high emission efficiency and long lifespan is difficult
Solution Approach 1:
The patent defines specific parameter ranges for the fused cyclic compound structure (ring types A1-A4, substituent groups R1-R5, R21-R23) that when satisfied, ensure both ease of synthesis and high emission efficiency with long lifespan, resolving the contradiction between material selection simplicity and performance
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 use of the fused cyclic compound in the emission layer results in improved emission efficiency and extended device lifespan, making it suitable for high-quality electronic apparatuses.
Implementation Method 1
Holes provided from the first electrode may move toward the emission layer through the hole transport region, and electrons provided from the second electrode may move toward the emission layer through the electron transport region. Carriers, such as holes and electrons, recombine in the emission layer to produce excitons. These excitons transition from an excited state to a ground state to thereby generate light.
Implementation Method 2
The fused cyclic compound included in the emission layer may be a condensed cyclic compound including a delayed fluorescence emitter, and the emission layer may be configured to emit delayed fluorescence.
Data Source
AI summary
A light-emitting device having a fused cyclic compound includes: a first electrode; a second electrode facing the first electrode; an interlayer between the first electrode and the second electrode and including an emission layer; and a fused cyclic compound of Formula 1:wherein, in Formula 1, the variables are as defined herein.