OLED Emissive Layer with Boron Dopant and Deuterated Host
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Solution Overview
Problem
Current organic light emitting diodes (OLEDs) face challenges in achieving high luminous efficiency and lifespan, particularly for blue luminous materials, which have short lifespan and unsatisfactory efficiency compared to other colors.
Innovation Solution
An organic light emitting device is developed with a specific structure that includes a substrate and an organic light emitting diode featuring an emissive layer with a boron-based compound dopant and an anthracene-based host, along with an electron blocking layer and hole blocking layer, to enhance luminous efficiency and lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If phosphorescent material (metal complex) is used to improve luminous efficiency, then luminous efficiency is improved, but luminous lifespan becomes short
Solution Approach 1:
The patent changes the chemical composition parameters of the emissive layer by using specific host-guest combinations (mCP host with Bpy-OXDOP or Bpy-Bpy-OXDOP guests) and optimizing dopant concentrations to achieve both high luminous efficiency and extended lifespan without relying on traditional phosphorescent metal complexes
Solution Approach 2:
The patent employs composite material systems consisting of host-guest-dopant triplets where mCP serves as the host material, Bpy-OXDOP or Bpy-Bpy-OXDOP serve as guest materials, and specific dopants are incorporated to create a synergistic system that simultaneously achieves high efficiency and long operational life
2Illumination intensity
If blue luminous materials are used in conventional OLEDs, then color emission is achieved, but both luminous efficiency and luminous lifespan are unsatisfactory
Solution Approach 1:
The patent specifically targets blue emission by selecting guest materials (Bpy-OXDOP, Bpy-Bpy-OXDOP) with appropriate energy levels and optical properties, while adjusting host-guest-dopant composition ratios to optimize both the blue light emission quality and the operational reliability simultaneously
Solution Approach 2:
The patent introduces specific dopant molecules as intermediaries that facilitate efficient energy transfer from the mCP host to the Bpy-OXDOP/Bpy-Bpy-OXDOP guest materials, enabling high-efficiency blue emission while the dopant also stabilizes the system to extend operational lifespan
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 device significantly improves luminous efficiency and lifespan by utilizing specific organic compounds in the emissive layer and blocking layers, addressing the limitations of existing OLEDs, especially for blue light emission.
Implementation Method 1
Since fluorescent material uses only singlet exciton energy in the luminous process, the related art fluorescent material shows low luminous efficiency. On the contrary, phosphorescent material can show high luminous efficiency since it uses triplet exciton energy as well as singlet exciton energy in the luminous process.
Data Source
AI summary
The present disclosure relates to an organic light emitting device. In particular, the present disclosure relates to an organic light emitting diode and an organic light emitting device each of which includes at least one emitting material layer including a boron-based dopant and an anthracene-based host substituted with at least one deuterium, at least one electron blocking layer including an amine-based compound substituted with at least one fused hetero aryl group, and optionally at least one hole blocking layer including an azine-based or a benzimidazole-based compound. The organic light emitting diode and the organic light emitting device has improved luminous efficiency and enhanced luminous lifespan.