sp3 Carbon Functional Layer for OLED Charge Balance
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Solution Overview
Problem
Existing OLED light-emitting devices face challenges in achieving efficient charge generation, transport, and injection, leading to issues such as color crosstalk and poor luminous efficiency.
Innovation Solution
A functional layer material centered on an sp3 hybridized carbon atom is used, comprising compounds with specific structures that act as hole-type and electron-type materials for efficient charge transport, and a light-emitting device structure with multiple light-emitting units and charge generation units is employed to enhance charge balance and recombination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional OLED light-emitting devices are used, then the basic light emission function is achieved, but the luminous efficiency is poor and the device lifespan is reduced
Solution Approach 1:
The patent introduces specific structural parameters (sp3 hybridized carbon atom core, aromatic rings, heteroatoms) to change the material properties, achieving both improved luminous efficiency and extended device lifespan through optimized charge transport characteristics
Solution Approach 2:
The patent employs composite material design by combining different functional groups (electron transport groups, hole transport groups, aromatic rings) within a single molecular structure to achieve balanced charge transport and improved device performance
2Productivity
If conventional charge transport materials are used, then charge generation and transport are achieved, but color crosstalk occurs and charge balance is poor
Solution Approach 1:
The patent introduces local quality differentiation by incorporating specific functional groups (electron transport groups at certain positions, hole transport groups at other positions) within the molecular structure to achieve localized charge transport control, preventing color crosstalk while maintaining efficient charge generation and transport
Solution Approach 2:
The patent changes molecular structure parameters (adding heteroatoms, adjusting aromatic ring configurations) to optimize charge transport efficiency and achieve better charge balance, thereby reducing color crosstalk
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 proposed solution improves the luminous efficiency and reduces the turn-on voltage of the light-emitting device, while also extending the device's lifespan by minimizing color crosstalk and improving charge transport efficiency.
Implementation Method 1
the first type of compound is a hole-type material used for transporting holes; and the second type of compound is an electron-type material used for transporting electrons
Implementation Method 2
These electrons and holes are combined to produce electron-hole pairs, and the produced electron-hole pairs are converted from a singlet state to a ground state to emit light
Data Source
AI summary
A functional layer material includes a compound centered on an sp3 hybridized carbon atom which includes a first type of compound. The first type of compound is selected from any of structures represented by a general formula (I), wherein at least one of a, b, m and n is not 0; A1 and A2 are independently selected from any of a substituted or unsubstituted trivalent aryl group, fused ring trivalent aryl group and fused ring trivalent heteroaryl group; B1 and B2 are independently selected from any of a substituted or unsubstituted alkylene group, arylene group and heteroarylene group; L1 to L4 are independently selected from any of a single bond, a substituted or unsubstituted phenylene group and biphenylene group; and Ar1 to Ar8 are independently selected from any one of a substituted or unsubstituted alkyl group, aryl group, heteroaryl group, fused ring aryl group and fused ring heteroaryl group.