Condensed Cyclic Compound Interlayers for High Luminance and Fast Response
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Solution Overview
Problem
Existing light-emitting devices face challenges in achieving high luminance, low driving voltage, and fast response speed while maintaining wide viewing angles and high contrast ratios.
Innovation Solution
Incorporation of a condensed cyclic compound represented by Formula 1 into the interlayer of a light-emitting device, which includes a first electrode, a second electrode, and an emission layer, with specific functional groups and linkages that enhance charge transport and recombination efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional light-emitting device structures are used, then device simplicity is maintained, but luminance and response speed are insufficient
Solution Approach 1:
The patent introduces a condensed cyclic compound with specific molecular structure (Formula 1) containing carbocyclic or heterocyclic rings at the core, which changes the material parameters of the emission layer. This molecular structure modification enables simultaneous achievement of high luminance and fast response without increasing device structural complexity
Solution Approach 2:
The patent employs a composite material system where the condensed cyclic compound is combined with host materials (e.g., mCP, TCTA, TAPC) in specific weight ratios (0.1-10 wt%). This composite approach optimizes both luminance output and response characteristics while maintaining device structural simplicity
2Illumination intensity
If high luminance is achieved through conventional means, then brightness is improved, but driving voltage increases
Solution Approach 1:
The condensed cyclic compound modifies the energy level parameters of the emission layer, creating favorable energy alignment between host and dopant materials. This parameter optimization enables efficient energy transfer and reduces driving voltage requirements while maintaining high luminance output
Solution Approach 2:
The patent uses the condensed cyclic compound as a dopant that copies and enhances the light-emitting properties of the host material. The dopant molecules (0.1-10 wt%) replicate and amplify the luminescent characteristics, achieving high luminance at lower driving voltages
3Speed
If fast response speed is achieved through material optimization, then response time is reduced, but luminance decreases
Solution Approach 1:
The specific molecular structure of the condensed cyclic compound (Formula 1) changes the recombination and emission parameters of charge carriers. The carbocyclic or heterocyclic ring structure facilitates rapid exciton recombination while maintaining high radiative efficiency, achieving both fast response and high luminance simultaneously
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 improves luminance, reduces driving voltage, and accelerates response speed, thereby enhancing the overall performance of the light-emitting device.
Implementation Method 1
Holes provided from the first electrode move toward the emission layer through the hole transport region, and electrons provided from the second electrode move toward the emission layer through the electron transport region. Carriers, such as holes and electrons, recombine in the emission layer to produce excitons. The excitons transition from an excited state to a ground state, thereby generating light.
Data Source
AI summary
Embodiments provide a condensed cyclic compound, a light-emitting device including the condensed cyclic compound, an electronic apparatus including the light-emitting device, and an electronic equipment including the light-emitting device. The condensed cyclic compound is represented by Formula 1, which is explained in the specification.