Boron-Containing Organic Compounds for Efficient Light Emission
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Solution Overview
Problem
Existing organic compounds in light-emitting devices have limitations in luminescence efficiency and lifespan, particularly in achieving high reverse intersystem crossing rates and radiative rates for improved display quality.
Innovation Solution
Incorporation of an organic compound with a boron atom that satisfies the condition kISC/kRISC≤10, enhancing intersystem crossing and radiative rates, and including a hole transport host, electron transport host, and sensitizer to form an exciplex, which accelerates the transition of triplet excitons to singlet excitons for efficient light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional organic compounds are used in light-emitting devices, then the device structure can be maintained with standard materials, but the luminescence efficiency and lifespan are limited
Solution Approach 1:
The patent changes the chemical composition parameters of the organic compound by incorporating a boron atom and designing specific molecular structures (Formula 1) that satisfy the condition kISC/kRISC ≤ 10. This parameter change in molecular structure enables accelerated reverse intersystem crossing rates and radiative rates, thereby improving luminescence efficiency while maintaining compatibility with existing light-emitting device architectures.
Solution Approach 2:
The patent employs composite material design by combining the boron-containing organic compound (Formula 1) with host materials and sensitizers to create an exciplex system. This composite approach leverages the synergistic effects of different materials: the boron compound provides high kRISC and kr values, the host materials facilitate charge transport, and sensitizers enhance energy transfer, collectively achieving superior luminescence efficiency and device lifespan.
2Device complexity
If conventional organic compounds are used, then material selection is simpler, but the lifespan of the light-emitting device is reduced
Solution Approach 1:
The patent addresses lifespan limitation by changing the chemical parameters of the organic emitter to include a boron atom in specific molecular configurations (Formula 1). This structural parameter change results in accelerated reverse intersystem crossing (kRISC) and radiative (kr) rates, which reduce the accumulation of triplet excitons and minimize degradation pathways, thereby extending device operational lifetime while managing material selection complexity through focused molecular design.
3Device complexity
If the reverse intersystem crossing rate is not accelerated, then the organic compound structure can be simpler, but the luminescence efficiency remains limited
Solution Approach 1:
The patent achieves high luminescence efficiency by changing the structural parameters of the organic compound to include a boron atom with specific coordination geometry and electronic configuration as shown in Formula 1. This structural modification fundamentally alters the spin-orbit coupling parameters, enabling accelerated reverse intersystem crossing rates that efficiently convert triplet excitons to singlet excitons for light emission, thereby achieving high luminescence efficiency with a relatively compact molecular structure.
Solution Approach 2:
The boron-containing organic compound acts as an intermediary species in the exciplex system, mediating energy transfer between the host materials and the emitted light. The specific molecular structure of the boron compound (Formula 1) facilitates efficient energy acceptance from the host and subsequent radiative decay, serving as a bridge that converts electrical energy to light with high efficiency while maintaining manageable structural complexity.
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 organic compound improves luminescence efficiency and extends the lifespan of light-emitting devices, leading to enhanced display quality in electronic apparatuses.
Implementation Method 1
kISC may be an intersystem crossing rate constant of the organic compound, and kRISC may be a reverse intersystem crossing rate constant of the organic compound
Implementation Method 2
the organic compound may have an accelerated reverse intersystem crossing rate and an accelerated radiative rate of a lowest singlet excited state
Implementation Method 3
an accelerated radiative rate of a lowest singlet excited state
Implementation Method 4
As the excitons transition from an excited state to a ground state, light may be generated
Data Source
AI summary
Embodiments provide a light-emitting device, an electronic apparatus including the light-emitting device, and an electronic equipment including the light-emitting device. The light-emitting device includes a first electrode, a second electrode facing the first electrode, and an interlayer between the first electrode and the second electrode and including an emission layer. The interlayer includes an organic compound including a boron (B) atom, wherein the organic compound satisfies Expression 1:kISC/kRISC≤10[Expression 1]In Expression 1, kISC is an intersystem crossing rate constant of the organic compound, and kRISC is a reverse intersystem crossing rate constant of the organic compound.