OLED Capping Layer With Tribenzazole Amine for UV Protection

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing organic light emitting devices (OLEDs) face challenges in maintaining luminescent efficiency and lifetime due to exposure to high-energy UV light and variations in viewing angle characteristics, necessitating a capping layer that absorbs UV light and adjusts refractive index for improved performance.

Innovation Solution

Incorporation of a capping layer comprising a tribenzazole amine derivative, represented by Formula 1, which absorbs UV light and adjusts refractive index to enhance viewing angle and efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a capping layer is added to absorb UV light and adjust refractive index, then device lifetime and viewing angle are improved, but device structure complexity increases

Engineering Contradiction:

Improvedevice lifetimeVSAvoiddevice structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The capping layer material (tribenzazole amine derivative) simultaneously performs multiple functions: UV absorption to protect organic layers and refractive index adjustment to improve viewing angle characteristics. This multi-functionality resolves the contradiction by achieving reliability improvement without requiring multiple separate components, thus limiting the increase in device structure complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent employs a composite material approach by developing a capping layer made of tribenzazole amine derivative that combines both UV absorption capability and appropriate refractive index properties. This single composite material solution addresses both protection and optical performance requirements, resolving the contradiction between improved reliability and device complexity.

Inventive Principle:

Principle #40Composite materials

2Productivity

If multiple layers are used to improve luminescent efficiency, then device performance is enhanced, but manufacturing complexity increases

Engineering Contradiction:

Improveluminescent efficiencyVSAvoidmanufacturing complexity

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

The capping layer material serves multiple functions simultaneously: UV absorption, refractive index control for viewing angle improvement, and contribution to overall luminescent efficiency. This multi-functionality reduces the need for additional specialized layers, thereby enhancing productivity without proportionally increasing manufacturing complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If UV-absorbing materials are applied to protect organic materials, then device lifetime is improved, but optical performance may deteriorate

Engineering Contradiction:

Improvedevice lifetimeVSAvoidoptical performance

Core Design Contradiction:

ReliabilityVSIllumination intensity

Solution Approach 1:

The patent carefully selects and optimizes the refractive index parameter of the capping layer material to ensure it complements the underlying organic layers for optimal optical performance. By controlling this physical parameter, the UV-absorbing capping layer protects organic materials while maintaining or even enhancing overall optical performance through proper light management.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The tribenzazole amine derivative capping layer acts as a composite solution that combines UV absorption properties with optimized optical properties including refractive index. This composite material approach ensures that protection function does not compromise optical performance, resolving the contradiction between reliability improvement and optical performance maintenance.

Inventive Principle:

Principle #40Composite materials

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 capping layer minimizes UV damage, improves light efficiency, reduces emission spectrum width, and increases viewing angle, maintaining device performance comparable to commercial OLEDs.

Implementation Method 1

the capping layer includes a tribenzazole amine derivative... which absorbs UV light and adjusts refractive index to enhance viewing angle and efficiency

Methodology Applied

Scientific EffectUV absorption: Absorption (EM radiation)

Implementation Method 2

the capping layer includes a tribenzazole amine derivative... which absorbs UV light and adjusts refractive index to enhance viewing angle and efficiency

Methodology Applied

Scientific EffectRefraction: Refraction

Data Source

PatentEP3875455B1Organic electroluminescent device comprising a tribenzazole amine derivative

Publication Date: 2025.12.10 LAPTO CO LTD

Figure 1~2

AI summary

Provided is a tribenzazole amine derivative represented by Formula 1 that effectively absorbs high energy UV light from an external light source to minimize damage to organic materials present in an organic electroluminescent device, contributing to a substantial improvement in the lifetime of the organic electroluminescent device. Also provided is an organic electroluminescent device using the tribenzazole amine derivative. The organic electroluminescent device includes a first electrode, a second electrode, and an organic layer arranged between the first and second electrodes. The organic layer includes the tribenzazole amine derivative.