Pyrene Derivative Stabilizes OLED Performance Across Deposition Rates
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Solution Overview
Problem
Existing organic electroluminescent elements exhibit high variations in luminous efficiency, driving voltage, and driving durability when the film forming rate is changed during vacuum deposition, failing to meet recent performance requirements.
Innovation Solution
Incorporating a pyrene derivative with a specific structure, represented by general formula (I), into the organic electroluminescent element, which is contained in at least one organic layer, including a light emitting layer, to stabilize performance across varying deposition rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional light emitting materials are used in organic electroluminescent elements, then the elements can operate at low voltage with high luminance, but the luminous efficiency, driving voltage, and driving durability show high variations when film forming rate is changed during vacuum deposition
Solution Approach 1:
The patent introduces a specific molecular structure parameter (pyrene derivative with formula I) that changes the material's inherent properties. This structural parameter makes the light emitting layer's performance insensitive to deposition rate variations, thereby stabilizing luminous efficiency, driving voltage, and driving durability across different manufacturing conditions
Solution Approach 2:
The patent uses a composite approach by combining the pyrene derivative compound with host materials (such as mCP, TCTA, or TAPC) to create a light emitting layer. This composite material system provides both high performance and reduced sensitivity to deposition parameters, as the pyrene derivative acts as a dopant or key component within the composite structure
2Adaptability or versatility
If the film forming rate is changed during vacuum deposition of light emitting layer, then manufacturing flexibility is improved, but luminous efficiency, driving voltage, and driving durability show high variations
Solution Approach 1:
By changing the molecular structure parameter to a pyrene derivative with formula I, the material achieves a state where performance metrics remain consistent across a wide range of deposition rates. This allows manufacturers to flexibly adjust deposition rates without compromising device performance
Solution Approach 2:
The pyrene derivative creates an equipotential performance state where luminous efficiency, driving voltage, and driving durability remain relatively constant despite variations in deposition rate. This is achieved through the material's inherent properties that buffer against deposition parameter changes
3Ease of manufacture
If conventional materials are used, then existing technology can be maintained, but performance does not reach the level required by recent applications
Solution Approach 1:
The patent combines the pyrene derivative with conventional host materials to create a composite light emitting layer that maintains compatibility with existing manufacturing processes while achieving superior performance levels required for modern display and lighting applications
Solution Approach 2:
The invention introduces a specific local molecular structure (pyrene derivative with formula I) into the light emitting layer that provides enhanced performance characteristics. This local structural improvement elevates the overall device performance without requiring complete redesign of the manufacturing process
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 organic electroluminescent element achieves good luminous efficiency, driving voltage, and driving durability with reduced dependence on deposition rate, enabling the production of high-performance devices such as display and illumination devices.
Implementation Method 1
utilize, for light emitting, energy of the exciton generated as a result of recombination of electrons injected from a cathode and holes injected from an anode in the organic layer
Implementation Method 2
formed by a vacuum deposition method
Data Source
AI summary
An organic electroluminescent element including a substrate, a pair of electrodes including an anode and a cathode, disposed on the substrate, and at least one organic layer including a light emitting layer, disposed between the electrodes. At least one kind of a compound represented by the following general formula (I) is contained in any layer of the at least one organic layer. The organic electroluminescent element has good luminous efficiency, driving voltage, and driving durability, and has low dependence of such performance on a deposition rate.Wherein: L1 to L4, n1 to n4, A1, A5, A6, A10 and, R are as defined in the application.