Triphenylene Derivative Blue Emitter OLED
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Solution Overview
Problem
There is a lack of efficient organic electroluminescence compounds that can emit blue light with a good Commission Internationale d'Énclairage y coordinate value (CIEy)≦0.15, which is essential for the development of stable and efficient organic light emitting diodes (OLEDs) for display and lighting applications.
Innovation Solution
Triphenylene derivatives with specific aromatic and heteroaromatic substituents are used in the structure of organic light emitting diodes, forming an emitting layer between the cathode and anode, enabling efficient blue light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional organic electroluminescence compounds are used, then device operation is possible, but luminescence efficiency and CIEy coordinate performance are insufficient for high-quality blue emission
Solution Approach 1:
The patent modifies molecular parameters by introducing specific substituents (Ar groups at positions 2 and 7, additional aromatic groups at positions 3, 6, and 9) on the triphenylene core structure. These structural parameter changes optimize both the luminescence efficiency and the CIEy coordinate to achieve high-quality blue emission with CIEy≤0.15
Solution Approach 2:
The patent creates composite molecular structures by combining triphenylene core with multiple aromatic substituents (Ar groups and additional aromatic groups). This composite structure achieves synergistic effects that simultaneously improve luminescence efficiency and color purity (CIEy coordinate performance)
2Illumination intensity
If efficient blue fluorophores are used to achieve high luminescence efficiency, then brightness improves, but CIEy coordinate value remains poor (greater than 0.15)
Solution Approach 1:
The patent applies local quality modification by placing specific aromatic groups (Ar) at predetermined positions (2 and 7) and additional aromatic groups at positions (3, 6, and 9) on the triphenylene structure. This localized structural optimization ensures that specific regions of the molecule contribute to achieving the target CIEy coordinate while maintaining overall high brightness
3Manufacturing precision
If new organic compounds are developed to achieve CIEy≤0.15, then color quality improves, but luminescence efficiency and device performance remain insufficient
Solution Approach 1:
The patent designs a multi-functional triphenylene derivative structure where the core triphenylene unit and its substituents work together to simultaneously achieve multiple objectives: optimizing CIEy coordinate to ≤0.15, maximizing luminescence efficiency, and ensuring stable device operation. The structure serves multiple functions within a single 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 triphenylene derivatives achieve high efficiency, lower operating voltage, higher brightness, and extended life hours for OLED devices, with improved luminescence properties matching the blue light spectrum and CIE coordinates.
Implementation Method 1
Application of triphenylene derivatives in organic electroluminescent devices
Data Source
AI summary
Triphenylene derivatives having a structure of formula (1) are provided. Ar represents an aromatic compound, n is 1 to 3, and each of R and R1 to R13 is a member independently selected from the group consisting of hydrogen, halo, cyano, trifluoromethyl, amino, C1-C10 alkyl, C2-C10 alkenyl, C2-C10 alkynyl, C3-C20 cycloalkyl, C3-C20 cycloalkenyl, C1-C20 heterocycloalkyl, C1-C20 heterocycloalkenyl, aryl and heteroaryl. The compound of the present invention may function as a host emitter or dopant in the emitter layer of OLED device. An OLED device is also herein provided.