Light-Emitting Element with Microcavity and Phosphorescent Guest
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Solution Overview
Problem
Current light-emitting elements, particularly those emitting blue light, face challenges in achieving high emission efficiency and color purity while maintaining low power consumption, which is crucial for advanced display and lighting devices.
Innovation Solution
A light-emitting element design incorporating a first and second electrode with a microcavity structure, where the EL layer includes a guest material that converts triplet excitation energy into light emission, with an emission spectrum peaked between 440 nm to 470 nm and a full width at half maximum of 20 nm to 80 nm, and a charge-generation layer to enhance light extraction efficiency and color purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a light-emitting element uses a phosphorescent compound to convert triplet excited state into light emission, then emission efficiency is improved, but power consumption is not sufficiently reduced and color purity is not sufficiently enhanced
Solution Approach 1:
The patent changes the emission spectrum parameters of the phosphorescent compound, specifically setting the peak wavelength between 440-470 nm and full width at half maximum between 20-80 nm, to achieve deep blue light with high color purity and reduced power consumption
Solution Approach 2:
The patent employs a composite structure combining a host material and a phosphorescent guest material, where the guest material is encapsulated within the host material matrix, enabling efficient triplet excited state conversion while achieving deep blue emission with high color purity
2Productivity
If a light-emitting element uses a phosphorescent compound, then emission efficiency is improved, but color purity is not sufficiently enhanced
Solution Approach 1:
The patent precisely controls the emission spectrum parameters of the phosphorescent compound, setting the peak wavelength between 440-470 nm and full width at half maximum between 20-80 nm, to achieve deep blue light with high color purity (chromaticity y < 0.20), thereby resolving the contradiction between emission efficiency and color purity
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 solution results in a light-emitting element with improved emission efficiency and color purity, capable of emitting deep blue light with high chromaticity y values, meeting various color standards, and reducing power consumption, thus suitable for advanced display and lighting applications.
Implementation Method 1
The first guest material is configured to convert triplet excitation energy into light emission
Implementation Method 2
The first electrode is configured to reflect light
Implementation Method 3
A light-emitting element design incorporating a first and second electrode with a microcavity structure
Data Source
AI summary
A light-emitting element that emits light with high color purity, a light-emitting element that emits light at high emission efficiency, or a light-emitting element with reduced power consumption. The light-emitting element includes a first electrode, a second electrode, and an EL layer. The first electrode is configured to reflect light. The second electrode is configured to reflect light and transmit light. The EL layer is between the first electrode and the second electrode. The EL layer includes a guest material. The guest material is configured to convert triplet excitation energy into light emission. The emission spectrum of the guest material in a dichloromethane solution has a peak in a wavelength region ranging from 440 nm to 470 nm and has a full width at half maximum of greater than or equal to 20 nm and less than or equal to 80 nm.