Compound

Novel electron-accepting compounds with optimized LUMO levels and absorption wavelengths address the limitations of existing materials, enhancing the spectral response and efficiency of organic photodetectors and photoresponsive devices.

GB2639044APending Publication Date: 2025-09-10SUMITOMO CHEM CO LTD
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Patent Information

Application Number
GB2024003416
Authority / Receiving Office
GB · GB
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-03-08
Publication Date
2025-09-10

AI Technical Summary

Technical Problem

Existing electron-accepting materials in organic photodetectors, such as fullerenes and non-fullerene acceptors, face limitations in achieving high efficiency and broad spectral response, particularly in the near-infrared region, limiting the performance of photoresponsive devices.

Method used

Development of novel compounds with specific structural formulas (I) and (II) that incorporate divalent and monovalent electron-accepting groups, bridging units, and electron-donating groups, designed to enhance the lowest unoccupied molecular orbital (LUMO) levels and absorption wavelengths, forming a bulk heterojunction layer with electron-donating materials to optimize energy transfer.

Benefits of technology

The new compounds improve the absorption wavelength to greater than 800 nm, enhancing the performance of organic photodetectors and photoresponsive devices by increasing their spectral response and efficiency.

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Abstract

A compound of formula (I) or (II): A2-(B1)x1-(D1)y1-(B1)x2-A3 (I) A2-(B2)z1-(D2)y2-(B3)x3-A1-(B3)x4-(D3)y3-(B2)z2-A3 (II) A1 is a divalent heteroaromatic electron-accepting group; A2 and A3 are each independently a monovalent electron-accepting group; D1, D2 and D3 are each independently an electron-donating group; B1, B2, and B3 are each independently a bridging group; x1–x4 are each independently 0, 1, 2 or 3; y1, y2 and y3 are each independently at least 1; z1 and z2 are each independently 0, 1, 2 or 3; and at least one occurrence of D1 of formula (I) or at least one occurrence of at least one of D2 and D3 of formula (II) is a group of formula (III): (III) wherein each X is independently O, S or Se; each R1 is independently H or a substituent; each R2 is independently H or a substituent with the proviso that at least one R2 is C5 heteroaryl or phenyl substituted with at least one R5 group wherein each R5 is independently C1-20 alkyl wherein one or more non-adjacent C atoms of the C1-20 alkyl may be replaced with O, S, NR3, COO, CONR3, or Si(R4)2 wherein each R3 is H or a substituent and each R4 is a substituent.
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