Light Emitting Element Molecular Weight Optimization
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Solution Overview
Problem
Existing light emitting devices, as described in prior art, do not achieve sufficient external quantum efficiency.
Innovation Solution
A light emitting device comprising an anode, a cathode, a light emitting layer with an iridium complex and a heterocyclic compound, and a hole transporting layer made of a crosslinked crosslinkable material, where the molecular weights of the iridium complex and heterocyclic compound satisfy specific ratios, enhancing external quantum efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional light emitting devices are used, then the device structure is simple, but the external quantum efficiency is insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the molecular weight ratio of the host compound to the dopant compound within 2:3 to 3:2, and the sum of molecular weights between 1000-5000 Da. This specific parameter optimization resolves the contradiction by achieving high external quantum efficiency through molecular weight parameter control without adding complex device structures.
Solution Approach 2:
The patent uses composite materials by combining specific host compounds (formula 1) with dopant compounds (formula 2) in defined molecular weight ratios. This composite approach enables high external quantum efficiency by leveraging the synergistic effects of properly proportioned material components rather than relying on structural complexity.
2Reliability
If the molecular weight ratio of host compound to dopant compound is not optimized, then the device structure remains simple, but the external quantum efficiency is low
Solution Approach 1:
The patent changes the molecular weight parameters of host and dopant compounds to specific ranges (sum: 1000-5000 Da, ratio: 2:3 to 3:2), which directly improves external quantum efficiency while maintaining ease of manufacture through conventional fabrication processes without requiring additional manufacturing steps.
3Reliability
If conventional host and dopant compounds are used, then the material selection is easy, but the external quantum efficiency is insufficient
Solution Approach 1:
The patent creates optimized composite materials by combining host compound (formula 1) and dopant compound (formula 2) in specific molecular weight ratios. This composite material approach achieves high external quantum efficiency through proper material composition rather than through complex device architecture.
Solution Approach 2:
The patent optimizes material parameters by selecting host and dopant compounds with specific molecular weight characteristics (sum: 1000-5000 Da, ratio: 2:3 to 3:2). This parameter optimization enables high external quantum efficiency with relatively simple material composition, avoiding the need for complex multi-component systems.
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 proposed configuration significantly improves external quantum efficiency in light emitting devices, optimizing the performance by adjusting the molecular weight ratios and structural composition of the light emitting layer and hole transporting layer.
Implementation Method 1
a light emitting device comprising an anode, a cathode, a light emitting layer disposed between the anode and the cathode
Implementation Method 2
a hole transporting layer disposed between the anode and the light emitting layer, wherein the hole transporting layer is a layer comprising a crosslinked body of a crosslinkable material
Data Source
AI summary
A light emitting device comprising an anode, a cathode, a light emitting layer disposed between the anode and the cathode, and a hole transporting layer disposed between the anode and the light emitting layer, wherein the light emitting layer is a layer comprising an iridium complex (A) and a heterocyclic compound constituted of typical elements (B), the hole transporting layer is a layer comprising a crosslinked body of a crosslinkable material, and the molecular weight (MA) of the iridium complex (A) and the molecular weight (MB) of the heterocyclic compound (B) satisfy the formula (M1-1) and the formula (M2-1): 2700≤MA+MB≤10000 0.35≤MA/MB≤3.00