Nitrogen-Containing OLED Emitter Materials for Efficiency and Lifetime
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Solution Overview
Problem
Existing organic electroluminescence display devices face challenges in achieving low driving voltage, high emission efficiency, and long lifetime of light emitting elements.
Innovation Solution
Incorporation of a nitrogen-containing compound represented by specific formulas in the functional layers of the light emitting element, including a first electrode, a second electrode, and at least one functional layer, which enhances emission efficiency and lifetime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional organic electroluminescence materials are used, then the light emitting element can be manufactured, but the emission efficiency is low and lifetime is short
Solution Approach 1:
The patent introduces a nitrogen-containing compound with specific molecular structure parameters (Formula 1 with defined substituents R1-R3, A1-A2, B1-B2) to change the chemical and physical properties of the emission layer, thereby improving both emission efficiency and lifetime simultaneously
Solution Approach 2:
The patent uses a composite approach by combining the nitrogen-containing compound (Formula 1) with other functional layers (hole transport layer, electron transport layer, etc.) to create a synergistic effect that improves overall device performance beyond what single materials could achieve
2Power
If conventional materials are used in the emission layer, then the device structure is simple, but the driving voltage is high
Solution Approach 1:
The patent modifies material parameters by introducing nitrogen-containing compounds with specific molecular weights, HOMO/LUMO levels, and structural configurations to optimize the energy alignment between layers, thereby reducing driving voltage while maintaining reasonable device structure
3Loss of energy
If existing organic electroluminescence materials are used, then the light emitting element operates, but the emission efficiency is insufficient
Solution Approach 1:
The patent optimizes emission efficiency by changing the chemical composition parameters of the emission layer materials, specifically using nitrogen-containing compounds with controlled substituent patterns (R1-R3, A1-A2, B1-B2) to enhance radiative recombination efficiency and reduce 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
Improves the emission efficiency and extends the lifetime of the light emitting element, leading to better display quality in electronic apparatuses.
Implementation Method 1
holes and electrons injected separately from a first electrode and a second electrode into (and recombine in) an emission layer of the light emitting element. The recombination of these charge carries (e.g., the holes and electrons) causes a light emitting material in the emission layer to emit light
Data Source
AI summary
A light emitting element includes a first electrode, a second electrode opposite to the first electrode, and at least one functional layer disposed between the first electrode and the second electrode and including a nitrogen-containing compound represented by Formula 1.