Heterocyclic Compound for Light-Emitting Device Efficiency
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Solution Overview
Problem
Existing light-emitting devices face challenges in achieving high luminescence efficiency and low driving voltage while maintaining excellent viewing angles and contrast ratios.
Innovation Solution
A light-emitting device is designed with a heterocyclic compound represented by Formula 1, which is incorporated into the interlayer or emission layer, along with a transition metal-containing compound and a delayed fluorescence compound, to enhance the device's performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional light-emitting materials are used, then device structure is simple, but luminescence efficiency is low and driving voltage is high
Solution Approach 1:
The patent employs composite material strategy by integrating multiple functional compounds (heterocyclic compound as host, transition metal-containing compound as emitter, delayed fluorescence compound as auxiliary) within the emission layer. This composite approach enables synergistic effects that simultaneously achieve high luminescence efficiency and appropriate device complexity, resolving the contradiction between performance improvement and structural simplicity.
Solution Approach 2:
The patent utilizes parameter changes by carefully optimizing the molecular structure parameters of the heterocyclic compound (Formula 1), including substituent groups (R1-R10a), ring structures (L1, Z1), and molecular configuration. These parameter optimizations enhance luminescence efficiency while maintaining reasonable device complexity through molecular design rather than structural complexity.
2Power
If conventional emission materials are used, then driving voltage is high, but material selection is simple
Solution Approach 1:
The patent applies composite materials principle by formulating an emission layer containing three types of compounds working together: heterocyclic compound (host), transition metal-containing compound (emitter), and delayed fluorescence compound (auxiliary). This composite material system enables low driving voltage operation through improved charge transport and recombination efficiency, while the material composition complexity is managed through systematic molecular design.
Solution Approach 2:
The heterocyclic compound acts as an intermediary substance that facilitates charge transport and energy transfer between electrodes and emission centers. Its molecular structure (Formula 1) is designed to mediate charge carrier movement, reducing driving voltage requirements while the material system complexity is controlled through its role as a bridging component in the emission layer.
3Reliability
If high luminescence efficiency is achieved through material optimization, then color purity and lifespan improve, but device manufacturing becomes more complex
Solution Approach 1:
The patent uses composite materials approach with carefully selected compound combinations that provide both high reliability (lifespan) and manageable manufacturability. The heterocyclic compound structure (Formula 1) with optimized substituents and the coordinated use of transition metal-containing and delayed fluorescence compounds create a stable emission layer that enhances device lifespan while maintaining compatibility with conventional manufacturing processes.
Solution Approach 2:
The patent applies local quality principle by optimizing specific molecular regions of the heterocyclic compound (Formula 1), such as substituent groups (R1-R10a) and ring structures (L1, Z1), to enhance local stability and luminescence properties. This localized optimization improves overall device lifespan and color purity without requiring complete redesign of the entire device structure, thus maintaining ease of manufacture.
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 heterocyclic compound and other materials in the light-emitting device results in improved luminescence efficiency, reduced driving voltage, and enhanced color purity, lifespan, and viewing angle characteristics.
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 the 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.
Data Source
AI summary
A light-emitting device including a heterocyclic compound, an electronic apparatus and electronic equipment that include the light-emitting device are provided. The heterocyclic compound has a bicarbazole core substituted with cycloalkyl and triarylsilyl groups which may suppress conjugation expansion and allow the heterocyclic compound to obtain a high triplet energy. Steric bulkiness of the heterocyclic compound may reduce interactions with a dopant compound and formation of an exciplex therewith.