Condensed Cyclic TADF Emitter for Low-Voltage OLED Luminance
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Solution Overview
Problem
Existing organic light-emitting devices face challenges in achieving enhanced performance in terms of luminance, driving voltage, and response speed, particularly in producing full-color images with wide viewing angles and short response times.
Innovation Solution
Incorporating a condensed cyclic compound represented by Formula 1 into the emission layer of the light-emitting device, which can serve as a thermally activated delayed fluorescence (TADF) emitter, enhancing the device's performance by improving luminance and response speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional organic light-emitting devices are used, then basic light emission is achieved, but luminance and response speed are insufficient
Solution Approach 1:
The patent applies parameter changes by modifying the molecular structure of the emission layer through condensed cyclic compounds with specific formulas (Formula 1, 1A, 2, 3). These structural parameters include ring systems (CY1-CY4), substituents (R1-R8), and connection groups (L1-L4, Y1-Y4), which are optimized to achieve both high luminance and fast response speed simultaneously
Solution Approach 2:
The invention uses composite materials by combining the condensed cyclic compound (Formula 1) with host materials in the emission layer. The compound serves as a dopant with specific concentration ranges (0.1-10 wt%), creating a composite emission system that leverages the synergistic effects of both components to improve luminance and response characteristics
2Use of energy by moving object
If driving voltage is reduced, then energy efficiency improves, but luminance performance may deteriorate
Solution Approach 1:
The patent changes the electrical parameters of the device by using condensed cyclic compounds with optimized HOMO-LUMO energy levels. The molecular structure parameters (Formula 1, 1A, 2, 3) are designed to achieve favorable charge injection and transport properties, enabling low driving voltage operation while maintaining high luminance output
3Adaptability or versatility
If full-color image production is achieved, then device functionality is enhanced, but response time increases
Solution Approach 1:
The patent applies local quality by using different condensed cyclic compounds (Formula 1, 2, or 3) in different emission layers or sub-pixels to produce different colors (red, green, blue). Each local region is optimized with specific molecular structures that maintain fast response characteristics while achieving full-color display capability
Solution Approach 2:
The invention utilizes periodic action through the use of thermally activated delayed fluorescence (TADF) mechanisms with specific lifetime characteristics. The emission process involves periodic transitions between singlet and triplet states, enabling efficient color production with controlled response times through molecular design
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 condensed cyclic compound results in improved luminance and response speed, enabling the production of full-color images with wide viewing angles and reduced driving voltage.
Implementation Method 1
the condensed cyclic compound may serve as a thermally activated delayed fluorescence (TADF) emitter, and the emission layer may emit delayed fluorescence
Data Source
AI summary
Embodiments provide a condensed cyclic compound, a light-emitting device including the condensed cyclic compound, and an electronic apparatus including the light-emitting device. The light-emitting device includes a first electrode, a second electrode facing the first electrode, and an interlayer between the first electrode and the second electrode, wherein the interlayer includes an emission layer, and the condensed cyclic compound. The condensed cyclic compound is represented by Formula 1, which is explained in the specification: