Condensed Cyclic Compound Design for Low-Voltage Blue OLEDs
Solution Overview
Problem
There is a need for luminescent materials for organic light-emitting devices that emit blue light with lower driving voltage and improved external quantum efficiency.
Innovation Solution
A condensed cyclic compound represented by Formula 1, which can be used in the emission layer of an organic light-emitting device, is introduced, featuring specific ring structures and substituents that enhance fluorescence emission and lower triplet energy levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional luminescent materials are used in organic light-emitting devices, then the device can emit blue light, but the driving voltage is high and external quantum efficiency is poor
Solution Approach 1:
The patent modifies the molecular structure of luminescent materials by changing chemical parameters - specifically introducing condensed cyclic structures with specific ring combinations (Y1-Y3 rings) and substituent groups (R1-R3, T11-T13, T21-T23) to optimize energy levels and emission characteristics, thereby reducing driving voltage and improving external quantum efficiency
Solution Approach 2:
The patent employs composite molecular structures combining multiple ring systems (carbocyclic and heterocyclic groups Y1-Y3) with various substituent groups to create a synergistic luminescent material that achieves both low driving voltage and high external quantum efficiency simultaneously
2Reliability
If conventional luminescent materials are used in organic light-emitting devices, then the device can emit blue light, but external quantum efficiency is poor
Solution Approach 1:
The patent optimizes the energy level parameters of the luminescent material by adjusting the cyclic compound structure, specifically the ring types (Y1-Y3) and substituent configurations, to achieve optimal triplet energy levels that improve external quantum efficiency while maintaining acceptable driving voltage
Solution Approach 2:
The patent creates a composite molecular architecture combining specific carbocyclic and heterocyclic ring systems with functional substituent groups to achieve synergistic effects that simultaneously improve external quantum efficiency and control driving voltage characteristics
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 compound enables organic light-emitting devices to emit blue light with lower driving voltage and improved external quantum efficiency, enhancing performance.
Implementation Method 1
featuring specific ring structures and substituents that enhance fluorescence emission
Implementation Method 2
featuring specific ring structures and substituents that enhance fluorescence emission and lower triplet energy levels
Data Source
AI summary
A condensed cyclic compound represented by Formula 1: Formula 1wherein in Formula 1, ring Y1 to ring Y3 are each independently a C5-C60 carbocyclic group or a C3-C60 heterocyclic group, W1 is O, S, N(T11), C(T12)(T13), or Si(T12)(T13), W2 is O, S, N(T21), C(T22)(T23), or Si(T22)(T23), n1 and n2 are each independently 0 or 1, and the sum of n1 and n2 is 1. Formula 1 is the same as described in the detailed description. A light-emitting device including the condensed cyclic compound, and an electronic apparatus including the light-emitting device are also disclosed.