Europium Complex Light Resistance via Ortho-Substituted Phosphine Oxide
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Solution Overview
Problem
Europium complexes with β-diketonato and phosphine oxide ligands lack descriptions of light resistance, which is crucial for their application as wavelength conversion materials in optoelectronics and energy fields.
Innovation Solution
A europium complex with specific substituents on a phenyl group in a triphenylphosphine oxide derivative, enhancing light resistance by introducing certain substituents on the phosphorus atom or using β-diketonato and triphenylphosphine oxide as ligands, resulting in compounds with improved stability under sunlight or ultraviolet irradiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If europium complexes with β-diketonato and phosphine oxide ligands are used as wavelength conversion materials, then intense luminescence is achieved, but light resistance is insufficient leading to degradation under sunlight or ultraviolet irradiation
Solution Approach 1:
The patent applies parameter changes by introducing specific substituents (cyclic alkyl groups with 3-10 carbons) at defined positions (two ortho positions of one phenyl group and para position of another phenyl group) in the triphenylphosphine oxide derivative structure. This structural modification changes the chemical parameters of the ligand, resulting in enhanced light resistance and reduced degradation under sunlight or ultraviolet irradiation while maintaining intense luminescence properties
2Reliability
If substituents are introduced on the phosphorus atom or specific positions of phenyl groups in triphenylphosphine oxide derivative, then light resistance is enhanced, but molecular structure complexity increases
Solution Approach 1:
The patent applies local quality by introducing cyclic alkyl group substituents only at specific localized positions (two ortho positions of one phenyl group and para position of another phenyl group) rather than throughout the entire molecule. This targeted substitution approach enhances light resistance at critical sites while minimizing overall molecular structure complexity and maintaining synthetic feasibility
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 europium complexes exhibit superior light resistance, reducing degradation and making them suitable for long-term use in wavelength conversion materials, such as films and LED fluorescent substances.
Implementation Method 1
The rare-earth metal complexes are characterized by absorbing a certain wavelength and becoming luminous in another wavelength, and are anticipated to be superior wavelength conversion materials.
Data Source
AI summary
To provide europium complexes having high photostability.A europium complex expressed with the following formula (A):{wherein, RA and RB are independently a cyclic alkyl group with 3 to 10 carbons, respectively, and RC is a cyclic alkyl group with 3 to 10 carbons or a phenyl group expressed with the following formula (B):(wherein, XA, XB, AC, XD and XE independently represent a hydrogen atom; a fluorine atom; an alkyl group with 1 to 3 carbon(s); an alkyloxy group with 1 to 3 carbon(s); an aryloxy group with 6 to 10 carbons; a fluoroalkyl group with 1 to 3 carbon(s); a fluoroalkyloxy group with 1 to 3 carbon(s); or a phenyl group that may be substituted with a fluorine atom, an alkyl group with 1 to 3 carbon(s), an alkyloxy group with 1 to 3 carbon(s), a fluoroalkyl group with 1 to 3 carbon(s), a fluoroalkyloxy group with 1 to 3 carbon(s), a fluorophenyl group, a hydroxyl group or a cyano group, respectively);RA is a cyclic alkyl group with 3 to 10 carbons;RB and RC are a phenyl group expressed with the formula (B), provided, however, that a case where RA a cyclohexyl group, and, RB and RC are a phenyl group is excluded; orRA, RB and RC independently represent an ortho-substituted phenyl group expressed with the following formula (Ba):(wherein, XE represents a hydrogen atom, an alkyl group with 1 to 3 carbon(s), an alkyloxy group with 1 to 3 carbon(s), a fluoroalkyl group with 1 to 3 carbon(s), a fluoroalkyloxy group with 1 to 3 carbon(s), a naphthyl group that may be substituted with a fluorine atom, a pyridyl group that may be substituted with a fluorine atom, or a phenyl group that is expressed with a formula (C):[wherein, ZA, ZC and ZE independently represent a hydrogen atom, a fluorine atom, an alkyl group with 1 to 3 carbon(s), an alkyloxy group with 1 to 3 carbon(s), a fluoroalkyl group with 1 to 3 carbon(s), a fluoroalkyloxy group with 1 to 3 carbon(s), a phenyl group that may be substituted with a fluorine atom, a hydroxyl group or a cyano group; ZB and ZD independently represent a hydrogen atom or a fluorine atom, respectively], provided, however, that a case where RA, RB and RC are all a phenyl group is excluded), respectively; RD represents a hydrogen atom, a deuterium atom or a fluorine atom; WA and WB independently represent an alkyl group with 1 to 6 carbon(s), a fluoroalkyl group with 1 to 6 carbon(s), a phenyl group, a 2-thienyl group or a 3-thienyl group; and ‘n’ represents an integer of 1 to 3}.