OLED Dopant Compound Formula 1 for High Efficiency
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Solution Overview
Problem
Current organic light emitting diodes (OLEDs) face challenges in achieving high emitting efficiency and display quality due to the limitations of existing emitting material layers.
Innovation Solution
An organic compound with a specific formula, where X1 and X2 are oxygen or sulfur, and R1 to R6 are selected from hydrogen, deuterium, halogen, cyano, silyl, alkyl, aryl, and heteroaryl groups, is used as a dopant in the emitting material layer, enhancing the efficiency and incorporating a delayed fluorescent compound to improve emitting efficiency and color purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional emitting materials are used in the EML, then the OLED structure is simple, but the emitting efficiency and display quality are insufficient
Solution Approach 1:
The patent uses a composite emitting material layer comprising a host compound and a dopant compound (Formula 1) with specific molecular structures containing X1-X2 bridges (oxygen or sulfur). This composite approach achieves high emitting efficiency (over 25 cd/A) and narrow FWHM (less than 50 nm) while maintaining a relatively simple two-component system that is easy to manufacture.
2Manufacturing precision
If existing dopant materials are used, then the manufacturing process is simple, but the color purity and emitting efficiency are limited
Solution Approach 1:
The patent achieves narrow FWHM (less than 50 nm) and high color purity by carefully controlling molecular parameters of the dopant compound, including the bridge type (oxygen or sulfur), substituent groups (R1-R6), and dopant concentration (0.1-10 wt%). These parameter optimizations enable high-quality emission without complicating the manufacturing process.
3Reliability
If conventional organic compounds are used as dopants, then the synthesis process is straightforward, but the quantum efficiency and emitting performance are insufficient
Solution Approach 1:
The patent achieves high quantum efficiency (over 25% external quantum efficiency) by optimizing the local molecular structure of the dopant compound, specifically the X1-X2 bridge region and substituent groups. The compound Formula (1) with controlled local structural quality provides excellent emitting performance while maintaining reasonable synthetic complexity through systematic molecular design.
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 compound significantly improves the emitting efficiency and display quality of OLEDs by providing high quantum efficiency and narrow full width at half maximum, leading to enhanced emitting performance and color purity.
Implementation Method 1
The OLED emits light by injecting electrons from a cathode as an electron injection electrode and holes from an anode as a hole injection electrode into an emitting material layer (EML), combining the electrons with the holes, generating an exciton, and transforming the exciton from an excited state to a ground state.
Implementation Method 2
incorporating a delayed fluorescent compound to improve emitting efficiency and color purity
Data Source
AI summary
The present disclosure relates to an organic compound of Formula 1, and an organic light emitting diode including the organic compound and an organic light emitting display device including the organic compound. The organic light emitting diode comprises a first electrode, a second electrode facing the first electrode, and a first emitting material layer positioned between the first and second electrodes, where the first emitting material layer includes the organic compound. The organic light emitting display device comprises a substrate, the above organic light emitting diode over the substrate, and an encapsulation film covering the organic light emitting diode.