Heterocylic compound and light-emitting device and electronic apparatus including the heterocyclic compound
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Solution Overview
Problem
Existing organic light-emitting devices (OLEDs) face challenges in achieving low driving voltage, high emission efficiency, and high external quantum efficiency, which are crucial for improving the performance of display devices.
Innovation Solution
Incorporating a heterocyclic compound represented by specific formulas in the emission layer of OLEDs, along with an interlayer structure that includes hole and electron transport regions, enhances the device's performance by optimizing carrier recombination and light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional organic light-emitting devices are used, then basic light emission is achieved, but driving voltage is high and emission efficiency is low
Solution Approach 1:
The patent modifies the chemical structure of organic compounds in the emission layer by introducing specific heterocyclic groups (Formula 1) with particular substituents (Formulae 1-1 and 1-2). This structural parameter change optimizes carrier recombination and energy transfer, resulting in reduced driving voltage and enhanced emission efficiency simultaneously
Solution Approach 2:
The patent employs a composite material system consisting of the heterocyclic compound (Formula 1) combined with host materials and other functional compounds (Formulae 201, 202, 601). This composite approach in the emission layer creates synergistic effects that improve both electrical characteristics (lower voltage) and optical performance (higher efficiency)
2Reliability
If conventional emission layers are used, then light emission is achieved, but external quantum efficiency is low
Solution Approach 1:
The patent optimizes the molecular parameters of the emission layer compounds (Formula 1, 201, 202, 601) to enhance exciton formation and light emission probability. The specific heterocyclic structure with defined substituents improves external quantum efficiency while maintaining compatibility with standard OLED manufacturing processes
Solution Approach 2:
The heterocyclic compound acts as an intermediary material in the emission layer, facilitating efficient energy transfer between charge carriers and host materials. This mediating role enhances external quantum efficiency without requiring complex multi-layer structures or additional manufacturing steps
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 leads to OLEDs with low driving voltage, high emission efficiency, and high external quantum efficiency, resulting in improved display performance.
Implementation Method 1
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.
Data Source
AI summary
A 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 and including an emission layer, wherein the interlayer includes a heterocyclic compound of Formula 1:A1B1]n1 Formula 1wherein, in Formula 1, the variables are defined herein.