OLED Red Emitter Rigid Conformation Efficiency Lifespan
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current organic light emitting diodes (OLEDs) face challenges in achieving high luminous efficiency and lifespan due to limitations in exciton generation efficiency and energy transfer in the emitting material layer, particularly with metal complex phosphorescent materials having short commercial lifespan.
Innovation Solution
Incorporating a specific red emitting material layer in OLEDs comprising a first compound, a second compound, and a third compound, where the first compound is an organometallic compound with a rigid chemical conformation, enhancing luminous efficiency and lifespan by optimizing the host and dopant configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If phosphorescent material (metal complex) is used as dopant to achieve high luminous efficiency, then luminous efficiency is improved, but luminous lifespan deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the dopant material by introducing a specific organometallic compound with a rigid chemical conformation (Formula 1-1) containing metal atoms (M) coordinated with nitrogen and carbon atoms in a specific geometric arrangement. This parameter change in molecular structure maintains efficient triplet exciton utilization while improving material stability and lifespan
Solution Approach 2:
The patent uses a composite emitting material layer comprising multiple compounds: the organometallic compound (Formula 1-1) as dopant, combined with host materials (Formula 2-1 and Formula 3-1). This composite structure synergistically combines the phosphorescent properties for high efficiency with the structural stability of the host-guest system, resolving the lifespan issue while maintaining luminous efficiency
2Reliability
If conventional emitting material layer is used, then device structure is simple, but luminous efficiency and lifespan are insufficient
Solution Approach 1:
The patent applies local quality by designing a specific rigid chemical conformation (Formula 1-1) with defined spatial arrangement of metal atoms, nitrogen atoms, and carbon atoms in the dopant molecule. This localized structural optimization at the molecular level enhances exciton management and energy transfer efficiency without requiring complex device-level modifications
Solution Approach 2:
The emitting material layer is segmented into distinct functional components: the organometallic dopant (Formula 1-1) responsible for phosphorescent emission, and host materials (Formula 2-1 and Formula 3-1) providing structural framework and energy transfer pathways. This segmentation allows independent optimization of each component's properties
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 significantly improves the driving voltage, luminous efficiency, and lifespan of OLEDs by utilizing a red emitting material layer with a specific organometallic compound structure, leading to improved color purity and emission characteristics.
Implementation Method 1
phosphorescent material exhibits a high luminous efficiency because it uses triplet exciton energy as well as singlet exciton energy in the luminous process
Implementation Method 2
the luminous efficiency and the luminous lifespan of the OLED are affected by the exciton generation efficiency in the host and the energy transfer efficiency from the host to the dopant
Implementation Method 3
the first compound is an organometallic compound with a rigid chemical conformation, enhancing luminous efficiency and lifespan
Data Source
AI summary
An organic light emitting diode and an organic light emitting device thereof are provided, each including a first compound represented by following structure, a second compound as a p-type host and a third compound as an n-type host in an emitting material layer. As a result, the organic light emitting diode and the organic light emitting device have advantages in the driving voltage, the luminous efficiency and the lifespan. The organic light emitting device includes the organic light emitting diode and can be a display device or a lighting device.