Donor-acceptor type thermally activated delayed fluorescent materials based on imidazo[1,2-f]phenanthridine and analogues
Inventors
Assignees
Arizona State University ASU • Arizona State University Downtown Phoenix campus
Publication Number
US-12193327-B2
Publication Date
2025-01-07
Expiration Date
2038-05-18
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Abstract
Donor-acceptor type thermally activated delayed fluorescent emitters based on imidazo[1,2-F]phenanthridine and analogues for full color displays and lighting applications.
Core Innovation
The invention discloses donor-acceptor type thermally activated delayed fluorescent materials based on imidazo[1,2-f]phenanthridine and analogues. These materials are designed according to General Formulas I-IV, where the various substituents such as R1, R2, and R3 can include hydrogen, cyanide, halogen, hydroxy, amino, nitro, thiol, or substituted or unsubstituted C1-C4 alkyl, alkoxy, or aryl groups, and other positions (X1–X15 or more) independently represent substituted or unsubstituted C, N, Si, O, or S, with valency and integer values as permitted.
The problem addressed by this invention arises from the limitations of current optical and electro-optical materials, such as poor processing ability, inefficient emission or absorption, and insufficient stability. Many available materials for use in devices like organic light emitting diodes (OLEDs) do not overcome these issues, creating a need for improved materials that provide efficient and stable light emission and absorption.
The inventive materials are specifically tailored for use in devices such as OLEDs, supporting full color display and lighting applications by exhibiting thermally activated delayed fluorescence. The compounds can be incorporated into various device structures, including multi-layer organic light emitting devices, as emissive materials and can be fine-tuned to emit different colors by modifying their electronic structure.
Claims Coverage
There are three core inventive features claimed across three independent claims.
Compound represented by General Formula I
A compound having a structure according to General Formula I, where: - R1, R2, and R3 each independently represent hydrogen, cyanide, halogen, hydroxy, amino, nitro, thiol, or substituted or unsubstituted C1-C4 alkyl, alkoxy, or aryl. - X1 through X15 (or additional positions for analogues) each independently represent substituted or unsubstituted C, N, Si, O, or S, as permitted by valence. - Each n is independently an integer as permitted by valence. This covers a broad class of donor-acceptor type TADF emitters rooted in imidazo[1,2-f]phenanthridine frameworks.
Organic light emitting diode comprising the claimed compound
An organic light emitting diode (OLED) that includes the compound described in General Formula I as an emissive material layer or within its device stack. - The claim directly covers the use of the compound within an OLED structure. - The OLED can incorporate the compound as part of the emissive, hole-transport, or electron-transport layers, providing utility in device architecture.
Light emitting device comprising the organic light emitting diode
A light emitting device that comprises the claimed OLED containing the compound of General Formula I. - The coverage explicitly extends to any device that contains the OLED as defined in the previous claim. - This encompasses full device implementations such as displays or lighting equipment embedding such OLEDs.
The claims broadly cover donor-acceptor thermally activated delayed fluorescent compounds based on imidazo[1,2-f]phenanthridine and analogues, their implementation in OLEDs, and the incorporation of such OLEDs into light emitting devices.
Stated Advantages
Addresses disadvantages of previous materials by enabling efficient emission or absorption, improved processing ability, and increased stability.
Documented Applications
Use in organic light emitting diodes (OLEDs) for full color displays.
Use in organic light emitting diodes (OLEDs) for lighting applications.
Use in a light emitting device comprising an OLED incorporating the claimed compounds.
Use in a luminescent display device comprising one or more of the claimed compounds.
Use in a photovoltaic device comprising one or more of the claimed compounds.
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