Dibenzoquinazoline Organic Compound for Light-Emitting Element Efficiency
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Solution Overview
Problem
Current light-emitting elements with organic compounds face challenges in improving element characteristics and reliability, particularly in achieving high luminous efficiency and low power consumption, due to limitations in electron-injection and transport properties.
Innovation Solution
A novel organic compound with a dibenzoquinazoline ring bonded to a skeleton with hole-transport properties via arylene groups, enhancing electron-injection and transport properties, and used in combination with phosphorescent compounds for improved light emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional organic compounds are used in light-emitting elements, then the device can operate, but the luminous efficiency is insufficient and power consumption is high
Solution Approach 1:
The patent modifies the molecular structure parameters of organic compounds by introducing dibenzoquinazoline ring structures with specific electron-transport properties. This structural parameter change optimizes the HOMO-LUMO energy gap and electron mobility, directly improving luminous efficiency and reducing power consumption in light-emitting elements
Solution Approach 2:
The patent creates composite organic compounds by combining dibenzoquinazoline ring structures with hole-transport skeletons through arylene group linkers. This composite molecular design integrates both electron-transport and hole-transport properties in a single material, enhancing overall device efficiency and reducing energy consumption
2Productivity
If the electron-injection property is improved, then the luminous efficiency increases, but the device structure becomes more complex
Solution Approach 1:
The patent merges electron-transport functionality and hole-transport functionality into a single organic compound molecule. The dibenzoquinazoline ring provides electron-transport capability while the attached skeleton provides hole-transport capability, eliminating the need for separate electron-transport and hole-transport layers and simplifying the overall device structure
Solution Approach 2:
The designed organic compound serves multiple functions simultaneously: it acts as both an electron-transport material and a hole-transport material. This multi-functionality is achieved through the amphoteric nature of the dibenzoquinazoline ring structure, which can accept and donate electrons, thereby improving luminous efficiency without requiring additional specialized materials or complex layered structures
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 novel organic compound improves the luminous efficiency and reliability of light-emitting elements by widening the energy gap and facilitating easy control of carrier balance, leading to high-efficiency light-emitting devices with reduced power consumption.
Implementation Method 1
The LUMO level of a structure in which the 2-position of the dibenzoquinazoline ring is hydrogen is deeper than that of a structure in which the 2-position of the dibenzoquinazoline ring is bonded to the skeleton with a hole-transport property. Accordingly, the organic compound of one embodiment of the present invention has an excellent electron-injection property and an excellent electron-transport property.
Implementation Method 2
used in combination with phosphorescent compounds for improved light emission efficiency
Data Source
AI summary
A novel organic compound that is effective in improving the element characteristics and reliability is provided. The organic compound, which is represented by General Formula (G1), has a structure in which a dibenzoquinazoline ring is bonded to a skeleton with a hole-transport property via one or more arylene groups.Any one of R1 to R9 in General Formula (G1) is bonded to any one of R10 to R14 in General Formula (G1-1). Note that n is any of 0 to 3; m is 1 or 2; A represents a single bond, or an arylene group; B represents a ring having a dibenzofuran skeleton, dibenzothiophene skeleton, or carbazole skeleton; and each of R1 to R15 independently represents any of hydrogen, an alkyl group, a cycloalkyl group, and an aryl group.