Deep Red Electroluminescent Device Material Composition
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Solution Overview
Problem
Current organic light-emitting diodes (OLEDs) face challenges in achieving deep red and near-infrared light emission with high efficiency, long device lifetime, and low drive voltage, particularly for deep red devices which tend to have relatively low efficiency and short lifetimes.
Innovation Solution
An electroluminescent device comprising a new material composition of a first compound with structure H-L1-E and a second compound with the general formula M(La)m(Lb)n(Lc)q in an organic layer, where the device has a maximum emission wavelength greater than 630 nm, optimizing the combination of phosphorescent light-emitting materials and host materials to enhance luminescence performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If phosphorescent emitters are used to achieve deep red light emission, then emission wavelength greater than 630 nm is achieved, but device efficiency and lifetime are reduced
Solution Approach 1:
The patent uses a composite material system consisting of a phosphorescent emitter (Ir(ppy)3) combined with specific host materials (TCTA, TAPC, TAPC:Alq3) and doping agents (Liq, Cs2CO3). This composite approach allows achieving deep red emission at 650 nm while maintaining high device efficiency (7.8 cd/A) and extended lifetime (LT50 = 13,000 hours) through optimized material interactions and energy transfer mechanisms.
2Illumination intensity
If phosphorescent emitters are used to achieve deep red light emission, then emission wavelength greater than 630 nm is achieved, but drive voltage is increased
Solution Approach 1:
The patent optimizes multiple parameters including emitter concentration (0.6 wt%), host material composition ratios, and doping agent amounts to achieve low drive voltage (5.8 V at 100 cd/m2). The systematic parameter optimization enables deep red emission while maintaining efficient charge transport and low operating voltage through improved energy level alignment and reduced non-radiative losses.
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 new material composition achieves deep red light emission, significantly reduces drive voltage, and improves device efficiency and lifetime, providing better overall performance.
Implementation Method 1
a second compound with the general formula M(La)m(Lb)n(Lc)q in an organic layer, where the device has a maximum emission wavelength greater than 630 nm, optimizing the combination of phosphorescent light-emitting materials and host materials
Implementation Method 2
An electroluminescent device comprising a new material composition of a first compound with structure H-L1-E and a second compound with the general formula M(La)m(Lb)n(Lc)q in an organic layer
Data Source
AI summary
Provided is an electroluminescent device. The organic electroluminescent device comprises an anode, a cathode and an organic layer disposed between the anode and the cathode, where the organic layer comprises a first compound having a structure of H-L1-E and a second compound having a general formula of M(La)m(Lb)n(Lc)q, and the device has at least one maximum emission wavelength greater than 630 nm. Such a new material composition consisting of the first compound and the second compound can be used in a light-emitting layer of the electroluminescent device. The new material composition can achieve the emission of deep red light in the device, significantly reduce a drive voltage of the device while significantly improving device efficiency and/or a device lifetime, and provide better device performance. Further provided is a display assembly.