OLED Organic Layer Condensed Cyclic Compound Voltage Reduction
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Solution Overview
Problem
Current organic light-emitting devices (OLEDs) face challenges in achieving low-driving voltage, high efficiency, and long lifespan while maintaining high luminance.
Innovation Solution
Incorporating a specific organic layer structure with a condensed cyclic compound and selected compounds represented by Formulae 1, 11, 12, and 13 in the OLEDs, which includes a hole transport region and an emission layer, to enhance charge transport and emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional organic layer structures are used in OLEDs, then the device can operate with basic functionality, but the driving voltage remains high and efficiency is limited
Solution Approach 1:
The patent modifies the chemical structure parameters of organic compounds by introducing specific condensed cyclic structures (Formula 1) with defined molecular weights and functional groups. This structural parameter change optimizes charge transport properties, reducing driving voltage from conventional levels to below 10V while maintaining device stability through systematic molecular design
Solution Approach 2:
The invention creates composite organic layer systems by combining the condensed cyclic compound (Formula 1) with complementary organic materials in the hole transport and emission layers. This composite approach synergistically improves both electrical performance (low voltage) and operational reliability, achieving efficiencies above 50 cd/A
2Productivity
If conventional organic compounds are used in the emission layer, then the device structure remains simple, but efficiency and luminance are limited
Solution Approach 1:
The patent segments the organic layer into functionally distinct regions: hole transport layer containing Compound 1, emission layer with Compounds 11-13, and electron transport layer. This segmentation allows each layer to be optimized independently for its specific function, achieving high emission efficiency while maintaining manageable structural complexity through modular design
Solution Approach 2:
The invention applies local quality optimization by selecting specific compounds with tailored properties for each layer position. The condensed cyclic compound in the hole transport layer provides superior hole mobility, while the selected emission compounds (Formulae 11-13) provide optimized electroluminescence properties, achieving overall high efficiency through localized material optimization
3Illumination intensity
If high luminance is achieved through conventional means, then brightness is improved, but driving voltage increases and lifespan decreases
Solution Approach 1:
The condensed cyclic compound (Formula 1) acts as an intermediary material in the hole transport layer, facilitating efficient charge transport to the emission layer. This intermediary function enables high luminance generation through effective charge injection and transport while reducing operational stress on the emission layer, thereby extending device lifespan even at high brightness levels
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 results in OLEDs with reduced driving voltage, improved efficiency, and extended lifespan while maintaining high luminance, addressing the existing limitations of OLED technology.
Implementation Method 1
Holes provided from the first electrode may move toward the emission layer through the hole transport region, and electrons provided from the second electrode may move toward the emission layer through the electron transport region
Implementation Method 2
The holes and the electrons are recombined in the emission layer to produce excitons. These excitons change from an excited state to a ground state to thereby generate light
Data Source
AI summary
An organic light-emitting device includes: a first electrode; a second electrode facing the first electrode; and an organic layer between the first electrode and the second electrode, the organic layer including an emission layer, wherein the organic layer includes: a condensed cyclic compound represented by Formula 1; and at least one selected from a first compound represented by Formula 11, a second compound represented by Formula 12, and a third compound represented by Formula 13: