Organic Light Emitting Device Host Material Exciplex
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Solution Overview
Problem
There is a need for organic light emitting devices with improved driving voltage, efficiency, and lifetime, as existing devices face limitations in these areas.
Innovation Solution
The organic light emitting device incorporates a specific structure including an anode, cathode, a light emitting layer with compounds of Chemical Formulas 1, 2, and 3, an electron blocking layer, and a hole transport layer, where the light emitting layer comprises indolocarbazole-based and biscarbazole-based compounds that act as P-type hosts, and a compound with pyridine, pyrimidine, or triazine bonded to indolocarbazole as an N-type host, enhancing hole transport and exciton recombination efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional organic light emitting devices use traditional host materials in the light emitting layer, then the device structure is simpler, but the driving voltage is higher and efficiency and lifetime are limited
Solution Approach 1:
The patent applies composite materials by combining P-type host materials (formulas 1 and 2) with N-type host materials (formula 3) in the light emitting layer. This composite host system creates synergistic effects that improve charge transport balance, reduce driving voltage, and enhance device efficiency while maintaining structural organization through distinct functional layers.
2Ease of manufacture
If conventional organic light emitting devices use traditional host materials, then the device is easier to manufacture, but efficiency and lifetime are limited
Solution Approach 1:
The patent changes key material parameters by introducing specific molecular structures with defined properties: P-type hosts (formulas 1 and 2) with specific hole transport capabilities and N-type hosts (formula 3) with electron transport properties. These parameter changes in material selection enable simultaneous achievement of high efficiency and manufacturability through established vacuum deposition and solution processing techniques.
3Device complexity
If conventional organic light emitting devices use traditional host materials, then the device structure is simpler, but lifetime is limited
Solution Approach 1:
The patent applies local quality by creating distinct functional zones within the light emitting layer: P-type host regions (formulas 1 and 2) optimized for hole transport and N-type host regions (formula 3) optimized for electron transport and exciton recombination. This spatial differentiation of material properties enhances recombination efficiency and reduces degradation, extending device lifetime while maintaining overall structural simplicity.
4Use of energy by moving object
If the light emitting layer uses a mixture of P-type and N-type host materials as specified, then driving voltage is reduced and efficiency is improved, but the device structure becomes more complex
Solution Approach 1:
The patent segments the light emitting layer into distinct functional components with clear boundaries: P-type host materials (formulas 1 and 2) and N-type host materials (formula 3) are used in specific weight ratios (95:5 to 50:50). This segmentation allows each material to perform its specialized function while maintaining overall device structural organization and simplifying the deposition process through sequential or mixed coating methods.
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
This configuration results in a device with lower driving voltage, higher efficiency, and extended lifetime by forming an exciplex and optimizing the host material combination, compared to devices using single or completely different host materials.
Implementation Method 1
an organic light emitting phenomenon refers to a phenomenon where electric energy is converted into light energy by using an organic material
Implementation Method 2
enhancing hole transport and exciton recombination efficiency... by forming an exciplex and optimizing the host material combination
Data Source
AI summary
Provided is an organic light-emitting device with improved driving voltage, efficiency, and lifetime, comprising: an anode; a cathode; a light emitting layer between the anode and the cathode; an electron blocking layer between the anode and the light-emitting layer; and a hole transport layer between the electron blocking layer and the anode, wherein the light-emitting layer includes a compound of Formula 1, a compound of Formula 2, and a compound of Formula 3:where A is a benzene ring condensed with two adjacent pentagonal rings, B is a benzene ring condensed with two adjacent pentagonal rings, and the other substituents are as defined in the specification.