Fluorinated Electron-Accepting Compounds for Organic Photodetectors
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Solution Overview
Problem
Current organic photodetectors face challenges in achieving optimal performance due to limitations in the design and properties of electron-accepting materials, particularly in the depth of the lowest unoccupied molecular orbital (LUMO) levels and solubility in solvents, which affect the efficiency and solubility of electron-accepting compounds.
Innovation Solution
The development of specific electron-accepting compounds of formulas (I) and (II), incorporating fluorinated groups to enhance solubility and tune electronic properties, are used in combination with electron-donating materials to form a photoactive layer in organic photodetectors, with the compounds being deposited using halogenated and non-halogenated solvents to create a structured active layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electron-accepting materials are used, then device structure is simple, but solubility and electronic properties are insufficient
Solution Approach 1:
The patent applies composite material design by combining electron-accepting groups (A1, A2) with electron-donating groups (D1, D2, D3) and bridging groups (B1, B2, B3) to create hybrid molecular structures. These composite structures integrate multiple functional units that collectively provide both solubility enhancement through fluorinated substituents and optimized electronic properties through the donor-acceptor architecture, resolving the contradiction between performance efficiency and structural complexity.
Solution Approach 2:
The patent implements local quality modification by introducing fluorinated groups at specific positions within the molecular structure (on bridging groups B1-B3 or on electron-accepting groups A1). This localized functionalization enhances solubility without requiring complete restructuring of the entire molecule, allowing optimization of specific properties (solubility) while maintaining the overall device structure simplicity and electronic function.
2Reliability
If electron-accepting materials with optimized LUMO levels are used, then device performance improves, but solubility in solvents deteriorates
Solution Approach 1:
The patent applies parameter change by modifying the molecular structure through addition of fluorinated groups and adjustment of the donor-acceptor ratio. These structural parameter changes simultaneously optimize the LUMO energy level (improving device performance) and enhance solubility in both halogenated and non-halogenated solvents, eliminating the trade-off between performance and manufacturability.
Solution Approach 2:
The patent uses local quality modification by adding fluorinated substituents at specific positions on the molecular structure. This localized change enhances solubility without altering the core electron-accepting functionality and LUMO level optimization, allowing independent optimization of solubility and electronic properties.
3Ease of manufacture
If fluorinated groups are added to enhance solubility, then solubility improves, but molecular structure complexity increases
Solution Approach 1:
The patent applies local quality modification by introducing fluorinated groups at specific positions on the molecular structure (on bridging groups or electron-accepting groups). This localized functionalization enhances solubility with minimal increase in overall molecular complexity, as the fluorinated groups are added as substituents rather than requiring complete molecular redesign.
Solution Approach 2:
The patent uses parameter change by controlling the number and position of fluorinated groups (at least one fluorinated group per molecule) to optimize solubility. This quantitative parameter adjustment provides a systematic approach to enhancing solubility while maintaining manageable molecular complexity through controlled substitution rather than complete structural redesign.
Data Source
AI summary
A compound of formula (I) or (II):A1-(B1)x1-(D1)y1-(B1)x2-A1 (I)A1-(B2)x5-(D2)y2-(B3)x3-A2-(B3)x4-(D3)y3-(B2)x6-A1 (II)wherein: A1 in each occurrence is independently a monovalent electron-accepting group; A2 is a divalent electron-accepting group; D1, D2 and D3 independently in each occurrence is an electron-donating group; y1, y2 and y3 are each independently at least 1; B1, B2, and B3 independently in each occurrence is a bridging group; x1-x6 are each independently 0, 1, 2 or 3 with the provisos that: in the case of the compound of formula (I) at least one of x1 and x2 is at least 1 and at least one B1 is substituted with a fluorinated group; and in the case of the compound of formula (II) at least one of x3, x4, x5 and x6 is at least 1 and at least one occurrence of at least one of B2 and B3 is substituted with a fluorinated group. The compound of formula (I) or (II) may be used as an electron-accepting material in a photoresponsive device.(NO FIGURE)