Blue Light Electroluminescent Material with Carbazole-Fluorene Structure
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Solution Overview
Problem
Current electroluminescent materials used in organic light emitting diodes have low luminous efficiency, leading to failures in these devices.
Innovation Solution
A method for manufacturing an electroluminescent material with a structural formula R3—R2—R1—R2—R3, where R1 is a carbazole group and R2 is a fluorene group, using specific reactants and solvents to achieve high electroluminescence efficiency, including a process involving carbazole and fluorene compounds with additives like sodium propan-2-olate and palladium acetate, and employing a luminescent device structure with layers such as a substrate, anode, hole injection, luminescent, and cathode layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electroluminescent materials are used in organic light emitting diodes, then the device structure can be maintained, but the luminous efficiency is low leading to device failure
Solution Approach 1:
The patent modifies the molecular structure parameters of electroluminescent materials by introducing specific functional groups (carbazole, fluorene, triphenylamine) and adjusting molecular weight ratios of reactants. These parameter changes result in materials with significantly improved luminous efficiency while maintaining device reliability
Solution Approach 2:
The patent creates composite electroluminescent materials by combining multiple functional groups (carbazole as electron donor, fluorene as π-bridge, triphenylamine as electron acceptor) into a single molecular structure. This composite approach achieves high luminous efficiency and blue light emission while resolving the reliability-efficiency contradiction
2Loss of energy
If new electroluminescent material structures are developed to improve luminous efficiency, then efficiency increases, but the manufacturing process becomes more complex
Solution Approach 1:
The patent segments the electroluminescent material synthesis into two distinct stages: first forming a core structure with carbazole and fluorene groups, then adding triphenylamine groups in a second step. This segmentation simplifies the manufacturing process while achieving the desired high efficiency performance
Solution Approach 2:
The patent performs preliminary actions by pre-synthesizing the core carbazole-fluorene structure before adding the triphenylamine functional groups. This preliminary structuring simplifies subsequent manufacturing steps and reduces overall process complexity while maintaining high luminous efficiency
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 approach results in an electroluminescent material with high luminous efficiency, emitting blue light and achieving a fluorescence quantum yield of 96.2%, effectively addressing the low efficiency issues in existing materials.
Implementation Method 1
the present application relates to a display field, and particularly to an electroluminescent material, a method for manufacturing the electroluminescent material, and a luminescent device
Implementation Method 2
achieving a fluorescence quantum yield of 96.2%
Data Source
AI summary
The present disclosure provides an electroluminescent material, a method for manufacturing the electroluminescent material, and a luminescent device, by employing a fluorenyl group showing good planarity and strong visible π-π* absorption as π-based system, and simultaneously introducing a compound containing a carbazole group as an electron donor and a compound containing aniline as an electron acceptor to realize an electroluminescent material, a method for manufacturing the electroluminescent material and a luminescent device with emitting a blue light and a high electroluminescence efficiency.