Copper(I) Complexes for Blue-Green OLED Emission
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Solution Overview
Problem
Current materials for organic light-emitting diodes (OLEDs) lack suitable compounds for emitting light in the blue and green regions of the electromagnetic spectrum, and there is a need for materials that can function as both emitter substances and electron blockers to enable the production of full-color displays.
Innovation Solution
Copper(I) complexes of specific formulas, where X is nitrogen or a C—R group, R is alkyl or aryl, Ar is phenyl or naphthyl, and Y is halogen, cyano, or other specified groups, are used in the light-emitting layers of OLEDs as emitter substances or electron blockers, allowing for electroluminescence in the blue and green regions and potential use in full-color displays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional materials are used in OLEDs, then device structure and operation are established, but suitable compounds for emitting light in the blue and green regions are lacking
Solution Approach 1:
The patent applies parameter changes by systematically varying the ligand structure parameters (different phosphine groups, phosphite groups, carboxylic acid derivatives) and copper complex composition to achieve electroluminescence across different wavelength regions (blue, green, red), thereby resolving the lack of suitable compounds for blue and green emission
Solution Approach 2:
The patent employs composite materials by creating copper(I) complexes with multifunctional ligands that combine electron transport, hole transport, and light emission properties, enabling these complexes to serve as both emitter substances and electron blockers in OLED layers
2Ease of operation
If separate emitter substances and electron blockers are used, then specific functions are performed, but device complexity and material requirements increase
Solution Approach 1:
The patent implements universality by designing copper(I) complexes that simultaneously exhibit electron blocking capability and light emission properties, allowing a single material to fulfill multiple functions in the OLED structure, thereby reducing device complexity and material requirements
Solution Approach 2:
The patent merges the functions of emitter substances and electron blockers into a single copper complex material, combining previously separate functional layers into a unified material system that performs both electron blocking and light emission
3Reliability
If additional matrix materials are used with emitter substances, then device performance is optimized, but manufacturing complexity increases
Solution Approach 1:
The patent extracts the emitter function from a separate emitter substance and integrates it directly into the copper(I) complex itself, which inherently possesses both electron blocking and light emission capabilities, thereby eliminating the need for additional matrix materials and simplifying manufacturing
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
These copper(I) complexes exhibit luminescence in the visible region, enabling efficient electroluminescence in OLEDs, particularly in the blue and green spectrum, and can be used without additional matrix materials, simplifying the production of OLEDs and enabling their use in full-color displays.
Implementation Method 1
the property of materials to emit light when they are excited by electrical current is utilized
Data Source
AI summary
The present invention relates to the use of copper(I) complexes of the formula IwhereX is nitrogen or a C—R group,R is alkyl or aryl,Ar is phenyl or naphthyl, each of which is optionally substituted by from one to three radicals selected from the group consisting of alkoxy, alkylthio, alkylamino, dialkylamino, alkoxycarbonyl, alkoxysulfonyl, halogen, cyano, carboxyl, hydroxysulfonyl and nitro, and the two optionally substituted phenyl or naphthyl radicals may be joined to one another by a chemical single bond via the carbon atoms in the α- and α′-position relative to the phosphorus atom,n is 1, 2 or 3,andY is halogen, cyano, thiocyanato, alkoxy, aryloxy, alkylthio, arylthio, alkylamino, dialkylamino, arylamino or diarylamino,in organic light-emitting diodes (OLEDs),The present invention further relates to light-emitting layers which comprise at least one copper(I) complex of the formula I, to OLEDs which comprise at least one copper(I) complex of the formula I or an inventive light-emitting layer, and to stationary visual display units which comprise inventive OLEDs.Furthermore, the present invention relates to novel copper(I) complexes of the formula Ia and Ibwhere R, Ar and n are each as defined in formula I, Y in formula Ia is defined as cyano, thiocyanato, alkoxy, aryloxy, alkylthio, arylthio, alkylamino, dialkylamino, arylamino or diarylamino, and Y in formula Ib is defined as halogen, cyano, thiocyanato, alkoxy, aryloxy, alkylthio, arylthio, alkylamino, dialkylamino, arylamino or diarylamino.