Heteronuclear Copper-Iridium Complex for Red Light Emission
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Solution Overview
Problem
Current organic electroluminescence (EL) devices lack efficient phosphorescent materials that emit light in the red wavelength region (590-630 nm) necessary for high-efficiency full-color display devices, and existing materials do not fully utilize triplet excitons for enhanced light emission.
Innovation Solution
A heteronuclear copper(I)-iridium(III) complex is developed, represented by specific formulas, incorporating pyrazolate ligands and cyclometalating ligands to facilitate efficient electron transport and emission of red light, which is integrated into the organic layer of EL devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If phosphorescent materials are used to utilize triplet excitons for high efficiency, then internal quantum efficiency can reach 100%, but materials emitting in the red wavelength region (590-630 nm) are still required for full-color display devices
Solution Approach 1:
The patent employs a heteronuclear complex combining copper(I) and iridium(III) centers with pyrazolate ligands to create a composite phosphorescent material that emits in the red wavelength region (590-630 nm) while achieving high internal quantum efficiency through triplet exciton utilization
Solution Approach 2:
The patent modifies the chemical composition and electronic structure parameters of the phosphorescent material by incorporating specific pyrazolate ligands and heteronuclear metal centers to tune the emission wavelength to the red region while maintaining high efficiency
2Device complexity
If fluorescent materials are used for light emission, then the device structure is simpler, but triplet excitons cannot be utilized leading to lower light emitting efficiency
Solution Approach 1:
The patent uses phosphorescent materials as an intermediary mechanism that enables triplet exciton utilization, bridging the gap between simple device structure and high light emitting efficiency by incorporating heavy metal atoms to facilitate spin-orbit coupling
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 heteronuclear copper(I)-iridium(III) complex enables high-efficiency light emission in the red wavelength region, improving the performance of organic EL devices by effectively utilizing both singlet and triplet excitons, leading to enhanced luminance efficiency and stability.
Implementation Method 1
a phosphorescent heteronuclear copper(I)-iridium(III) complex... a luminescent heteronuclear copper(I)-iridium(III) complex emitting light in a red wavelength region
Implementation Method 2
When a heavy metal, such as Ir, Pt, Rh, or Pd is included in an organic molecule, spin-orbital coupling occurs due to a heavy atom effect, and thus, singlet excitons and triplet excitons are mixed, thereby enabling transition to occur and thus effective phosphorescence even at room temperature can be obtained
Implementation Method 3
Organic electroluminescence (EL) devices are active display devices using the phenomenon of light generation occurring due to the recombination of electrons and holes in a fluorescent or phosphorescent organic compound thin layer when a current is applied to the organic layer
Data Source
AI summary
Provided are a high-efficiency, photoluminescent heteronuclear copper (I)-iridium (III) complex and an organic electroluminescent device using the complex. The photoluminescent heteronuclear copper (I)-iridium (III) complex can be used to form an organic layer of an organic electroluminescent device, can emit light of 590-630 nm as a high-efficiency, photoluminescent material, and provides a high brightness and a low turn-on voltage.