Organic Electroluminescent Material for OLED Efficiency and Lifetime
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing organic electroluminescent materials face limitations in luminescent efficiency and lifetime, with difficulty in adjusting the luminescence spectral peak, hindering the development of efficient OLED devices.
Innovation Solution
Development of an organic electroluminescent material with a specific molecular structure, defined by formula (I), which allows for adjustment of the luminescence spectral peak by varying groups on the molecular structure, and a process involving boration and reaction with a metal catalyst to produce the material for use in OLED devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional organic electroluminescent materials are used, then the device can operate, but the luminescent efficiency and lifetime are limited
Solution Approach 1:
The patent applies parameter changes by systematically modifying the molecular structure parameters of the electroluminescent material. Specifically, it introduces different substituent groups (R1-R6) at various positions on the core molecular framework, and varies the number of carbazolyl groups (n=1-3) to optimize the luminescent properties. This structural parameter optimization directly improves both luminescent efficiency and device lifetime
Solution Approach 2:
The patent employs composite material design by combining multiple functional moieties into a single molecular structure. The material integrates carbazolyl groups (for hole transport and stability), benzothiazole or benzoxadiazole cores (for luminescence), and various substituent groups (for property tuning), creating a composite molecular structure that simultaneously achieves high luminescent efficiency and extended lifetime
2Adaptability or versatility
If the molecular structure is kept simple, then the synthesis is easier, but the luminescence spectral peak cannot be adjusted
Solution Approach 1:
The patent applies segmentation by dividing the molecular structure into distinct functional segments: a core luminescent unit (benzothiazole or benzoxadiazole), carbazolyl substituent groups, and additional R-groups for fine-tuning. This segmented architecture allows independent optimization of each segment's function while maintaining overall molecular stability and synthesizability
Solution Approach 2:
The patent implements local quality by introducing specific substituent groups (R1-R6) at localized positions on the molecular framework. Each substituent can be independently selected to modify local electronic properties, thereby adjusting the luminescence spectral peak without requiring complete redesign of the entire molecular structure. This localized modification approach enables spectral tuning while keeping the core structure relatively simple
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 material improves luminescent efficiency and lifetime of OLED devices, enabling adjustable luminescence spectral peaks, enhancing device performance.
Implementation Method 1
The organic electroluminescence phenomenon was first reported in the early 1960s. Pope and other people observed blue light when a high voltage of 400V was imposed to both sides of a single crystal of anthracene
Data Source
AI summary
The present invention provides an organic electroluminescent material, the process for preparing same and an OLED device using same. The organic electroluminescent material has a general formula (I): wherein, each of R1, R2, R3 and R4 is independently selected from the group consisting of H, C1-C20 alkyl, C1-C20 alkoxy, ether groups and aromatic amino groups; each of Z is carbon atom or each of Z is nitrogen atom; R is carbazolyl, wherein, n is an integer ranging from 1 to 3 when each of Z is carbon atom, and n is an integer ranging from 1 to 2 when each of Z is nitrogen atom. The organic electroluminescent material of the invention can be used as emitting layer material in an OLED device and improve the luminescent efficiency and lifetime of the device. The luminescence spectral peakmay be adjusted by changing the group on the molecular structure.