Organic Electroluminescent Device Host-Dopant Charge Balance
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Solution Overview
Problem
Organic electroluminescent devices face issues with low luminous efficiency and shorter service life, necessitating improvements in their performance.
Innovation Solution
Incorporating a specific luminescent layer host material combination, comprising a first compound with strong electron properties and a second compound with relatively strong hole properties, to adjust charge balance and enhance device performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional organic electroluminescent devices are used, then the device structure is simple, but the luminous efficiency is low and service life is short
Solution Approach 1:
The patent changes the chemical composition parameters of the luminescent layer by introducing specific host materials (formula 1 compounds) and dopant materials (formula 2 compounds) with defined molecular structures. This parameter change optimizes charge transport and recombination efficiency, simultaneously improving luminous efficiency and service life through enhanced material properties
Solution Approach 2:
The patent creates a composite luminescent layer system combining host materials and dopant materials in specific ratios. The host material provides the structural framework while the dopant material enhances luminescence properties, creating a synergistic composite system that achieves both high luminous efficiency and extended service life
2Power
If conventional organic electroluminescent devices are used, then the device structure is simple, but the driving voltage is too high
Solution Approach 1:
The patent modifies the electrical parameters of the organic layer by selecting host and dopant materials with specific HOMO-LUMO energy levels and charge mobility characteristics. This parameter optimization reduces the energy barrier for charge injection and transport, thereby lowering driving voltage while maintaining device functionality
Solution Approach 2:
The host material acts as an intermediary between the electrodes and the dopant material, facilitating efficient charge transport and energy transfer. This intermediary role enables lower driving voltages by improving charge carrier mobility and reducing resistance in the organic layer
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 use of this compound combination significantly improves current efficiency and extends the service life of organic electroluminescent devices, reducing operating voltage and increasing luminous efficiency.
Implementation Method 1
When a voltage is applied to the organic electroluminescent device, holes and electrons are injected into the luminescent layer from the anode and the cathode, respectively, and the injected holes and electrons combine in the luminescent layer to form excitons in an excited state, and the excitons release energy outwards, causing the luminescent layer to emit light outwards.
Data Source
AI summary
The present disclosure provides an organic electroluminescent device and an electronic apparatus. The organic electroluminescent device includes a cathode, an anode, and an organic layer. The organic layer includes an organic luminescent layer including a first compound and a second compound; the first compound is selected from compounds represented by a formula 1; and the second compound is selected from compounds represented by a formula 2.