Boron Compound TADF OLED Emitter Design
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Solution Overview
Problem
Boron-containing compounds for organic light-emitting diodes (OLEDs) face challenges with low internal quantum efficiency (IQE) and sensitivity to air and moisture, limiting their application in OLEDs, while existing phosphorescence materials are costly and unable to produce blue OLEDs efficiently.
Innovation Solution
A boron-containing compound with a specific structure, featuring 9,10-diboraanthracene as an electron accepting group and electron donating groups, exhibits thermal activated delayed fluorescence (TADF) properties, enhancing IQE and stability, and is used as a dopant in the emitting layer of OLEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If boron-containing compounds are used as OLED materials, then cost is reduced and color tunability is improved, but internal quantum efficiency remains low (rarely exceed 30%)
Solution Approach 1:
The patent employs composite material design by combining boron-containing compounds with specific host materials (e.g., TCTA, TAPC) and dopants (e.g., Alq3, BCP) to create a multi-component emitting layer. This composite approach allows the boron-containing compound to function as an effective dopant within the host-guest system, achieving high internal quantum efficiency (exceeding 30%) while maintaining the inherent advantages of boron-based materials including low cost and wide color tunability.
2Adaptability or versatility
If boron-containing compounds are used as OLED materials, then color tunability is improved, but sensitivity to air and moisture increases
Solution Approach 1:
The patent implements inert atmosphere protection by encapsulating the boron-containing compound within an OLED structure that includes protective layers (electron transport layer, electron injection layer, and encapsulation layers). These layers create a barrier that isolates the boron-containing compound from air and moisture, reducing sensitivity to environmental factors while preserving the compound's excellent color tunability across blue, green, and red regions.
3Reliability
If phosphorescence materials with noble metals are used, then internal quantum efficiency reaches 100%, but cost increases significantly
Solution Approach 1:
The patent applies the principle of substituting expensive noble metal-based phosphorescence materials with inexpensive boron-containing compounds. While boron-containing compounds alone have limited efficiency, the patent enhances their performance through composite material design with host materials and dopants, achieving practical efficiency levels without requiring expensive noble metals like Ir, Pt, Os, or Ru, thereby significantly reducing material costs.
4Reliability
If phosphorescence materials are used, then internal quantum efficiency reaches 100%, but blue OLEDs cannot be manufactured efficiently
Solution Approach 1:
The patent utilizes parameter changes by adjusting the molecular structure of boron-containing compounds to achieve different emission colors. By modifying structural parameters (substituents, conjugation length, and molecular geometry), the patent enables efficient blue, green, and red emission from boron-based materials, overcoming the limitation of phosphorescence materials which cannot efficiently produce blue OLEDs.
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 boron-containing compound achieves high efficiency, low cost, and wide color tunability for OLEDs, with external quantum efficiency comparable to phosphorescence materials and improved air/moisture stability, overcoming previous limitations.
Implementation Method 1
Thermal activated delayed fluorescence (TADF) materials are the third generation organic light emitting materials, which are developed after the fluorescence materials and the phosphorescence materials. The energy gap of the singlet excited state and the triplet excited state (ΔEST) of the TADF materials is small, which allows excitons to transition from the triplet excited state to the singlet excited state through reverse intersystem crossing (RISC).
Implementation Method 2
The energy gap of the singlet excited state and the triplet excited state (ΔEST) of the TADF materials is small, which allows excitons to transition from the triplet excited state to the singlet excited state through reverse intersystem crossing (RISC).
Implementation Method 3
An OLED refers to a component having an emitting layer made of organic molecules, which can emit light in response to a driving voltage.
Data Source
AI summary
The present disclosure relates to a boron-containing compound including a structure of Formula (I), and the use of the compound as a dopant in an emitting layer of an organic light emitting diode. The present disclosure also relates to an emitting layer of an organic light emitting diode and an organic light emitting diode device.