Host Material for Phosphorescent Light Emitting Devices
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Solution Overview
Problem
Existing light emitting devices using compositions with compounds like H0-1 and FIrpic or HO-2 and B0 suffer from insufficient light emission efficiency.
Innovation Solution
A composition comprising a compound represented by formula (C-1) and a phosphorescent compound represented by formula (1), where the compound (C-1) acts as a host material, enhancing the light emission efficiency of the light emitting device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional compositions (e.g., H0-1 with FIrpic or HO-2 with B0) are used in light emitting devices, then the device can be manufactured with existing materials, but the light emission efficiency is insufficient
Solution Approach 1:
The patent changes the chemical structure parameters of the host material by introducing specific substituents (R1-R6) at defined positions on the core molecular structure. This structural parameter optimization enables better energy transfer to the phosphorescent dopant, significantly improving light emission efficiency while maintaining compatibility with existing manufacturing processes
Solution Approach 2:
The patent creates a composite light emitting layer by combining the newly designed host compound (C-1) with phosphorescent dopants (formula 1) and appropriate solvents. This composite material system achieves synergistic effects where the host material provides structural stability and the dopant provides efficient phosphorescence, resolving the contradiction between manufacturability and light emission efficiency
2Adaptability or versatility
If existing phosphorescent compounds (FIrpic, B0) are used with conventional hosts, then the composition can be produced with current materials, but the light emission efficiency remains insufficient
Solution Approach 1:
The patent optimizes the energy level parameters of the host material through systematic substitution patterns. The substituents R1-R6 are positioned to tune the HOMO-LUMO gap and triplet energy levels, ensuring optimal energy transfer to various phosphorescent dopants while maintaining broad material compatibility
Solution Approach 2:
The host compound (C-1) is designed with universal applicability to work with multiple types of phosphorescent dopants (formula 1). The core structure with adjustable substituents provides a platform that can accommodate different dopant molecules, making the host material versatile across various phosphorescent systems while consistently achieving high light emission efficiency
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 composition significantly improves the light emission efficiency of the light emitting device, making it more effective for display and lighting applications.
Implementation Method 1
a phosphorescent compound represented by formula (1)
Data Source
AI summary
To provide a composition which is useful for production of a light emitting device excellent in light emission efficiency. A composition comprising a compound represented by the formula (C-1) and a phosphorescent compound represented by the formula (1): [wherein, Ring R1C to Ring R4C represent an aromatic hydrocarbon ring or an aromatic hetero ring. RC represents a carbon atom, a silicon atom, a germanium atom, a tin atom or a lead atom.] [wherein, M1 represents a rhodium atom, a palladium atom, an iridium atom or a platinum atom. n1 represents an integer of 1 or more, and n2 represents an integer of 0 or more. n1+n2 is 2 or 3. Ring R1A represents a triazole ring. Ring R2 represents an aromatic hydrocarbon ring or an aromatic hetero ring. E1, E2 and E11A to E13A represent a nitrogen atom or a carbon atom. R11A to R13A represent a hydrogen atom, an alkyl group, an aryl group or the like. A1-G1-A2 represents an anionic bidentate ligand.].