OLED Emitting Layer Composition for Low-Voltage Long-Life Operation
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Solution Overview
Problem
Existing organic electroluminescence devices face challenges in achieving low driving voltage and long lifetime.
Innovation Solution
Incorporating specific compounds in the emitting layer, such as those represented by formulas (1), (11), (21), (31), (41), (51), (61), (71), and (81), which enhance the efficiency and stability of hole and electron recombination, thereby reducing the driving voltage and increasing the device's lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional organic electroluminescence device structures are used, then the device can operate, but the driving voltage is high and the lifetime is short
Solution Approach 1:
The patent applies parameter changes by modifying the chemical structure of the emitting layer compounds. Specifically, it uses compounds with formula (1) containing X1 (oxygen or sulfur atom) and various aryl/heterocyclic groups (Ar1, L1, R1-R8, R11-R19) to optimize the electronic properties of the emitting layer, achieving lower driving voltage and longer lifetime through molecular design rather than structural redesign
Solution Approach 2:
The patent employs composite materials by combining the compound of formula (1) with multiple other compounds from formulas (11), (21), (31), (41), (51), (61), (71), and (81) in the emitting layer. This composite approach creates synergistic effects that improve both efficiency and stability, resolving the contradiction between device lifetime and energy consumption
2Reliability
If the emitting layer uses simple compound structures, then the device is easier to manufacture, but the recombination efficiency of holes and electrons is low
Solution Approach 1:
The patent changes the molecular parameters of the emitting layer compounds by introducing specific functional groups (X1 as oxygen or sulfur, Ar1 as aryl or heterocyclic groups, L1 as linking groups) in formula (1). These parameter modifications enhance the recombination efficiency of holes and electrons while maintaining reasonable manufacturing feasibility through established organic electronics fabrication processes
Solution Approach 2:
The patent applies local quality by introducing specific functional moieties (X1, Ar1, L1, R1-R8, R11-R19) at specific positions within the compound structure. This localized optimization of molecular properties enhances recombination efficiency at the molecular level without requiring complete redesign of the entire device structure
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 compounds lead to an organic electroluminescence device with lower operating voltage and extended lifespan, improving overall performance.
Implementation Method 1
When voltage is applied to an organic electroluminescence device, holes and electrons are injected into an emitting layer from an anode and a cathode, respectively. Then, thus injected holes and electrons are recombined in the emitting layer, and excitons are formed therein.
Data Source
AI summary
An organic electroluminescence device containing a cathode, an anode, and an emitting layer disposed between the cathode and the anode, wherein the emitting layer contains a compound represented by the following formula (1) and one or more compounds selected from the group consisting of a compound represented by the specific formulas (11), (21), (31), (41), (51), (61), (71), and (81).