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Open AccessEfficient near-infrared organic light-emitting diodes with emission from spin doublet excitons
The development of luminescent organic radicals has resulted in materials with excellent optical properties for near-infrared emission. Applications of light generation in this range span from bioimaging to su...
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Article
Open AccessDecoupling excitons from high-frequency vibrations in organic molecules
The coupling of excitons in π-conjugated molecules to high-frequency vibrational modes, particularly carbon–carbon stretch modes (1,000–1,600 cm−1) has been thought to be unavoidable1,2. These high-frequency mode...
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Open AccessReversible spin-optical interface in luminescent organic radicals
Molecules present a versatile platform for quantum information science1,2 and are candidates for sensing and computation applications3,4. Robust spin-optical interfaces are key to harnessing the quantum resources...
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Article
Dielectric control of reverse intersystem crossing in thermally activated delayed fluorescence emitters
Thermally activated delayed fluorescence enables organic semiconductors with charge transfer-type excitons to convert dark triplet states into bright singlets via reverse intersystem crossing. However, thus fa...
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Article
Open AccessSinglet and triplet to doublet energy transfer: improving organic light-emitting diodes with radicals
Organic light-emitting diodes (OLEDs) must be engineered to circumvent the efficiency limit imposed by the 3:1 ratio of triplet to singlet exciton formation following electron-hole capture. Here we show the sp...
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Article
Open AccessSpontaneous exciton dissociation enables spin state interconversion in delayed fluorescence organic semiconductors
Engineering a low singlet-triplet energy gap (ΔEST) is necessary for efficient reverse intersystem crossing (rISC) in delayed fluorescence (DF) organic semiconductors but results in a small radiative rate that li...
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Open AccessElectron spin resonance resolves intermediate triplet states in delayed fluorescence
Molecular organic fluorophores are currently used in organic light-emitting diodes, though non-emissive triplet excitons generated in devices incorporating conventional fluorophores limit the efficiency. This ...
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Understanding the luminescent nature of organic radicals for efficient doublet emitters and pure-red light-emitting diodes
The doublet-spin nature of radical emitters is advantageous for applications in organic light-emitting diodes, as it avoids the formation of triplet excitons that limit the electroluminescence efficiency of no...
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Fast spin-flip enables efficient and stable organic electroluminescence from charge-transfer states
A spin-flip from a triplet to a singlet excited state, that is, reverse intersystem crossing (RISC), is an attractive route for improving light emission in organic light-emitting diodes, as shown by devices us...
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High stability and luminescence efficiency in donor–acceptor neutral radicals not following the Aufbau principle
With their unusual electronic structures, organic radical molecules display luminescence properties potentially relevant to lighting applications; yet, their luminescence quantum yield and stability lag behind...
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Efficient radical-based light-emitting diodes with doublet emission
Organic light-emitting diodes (OLEDs)1–5, quantum-dot-based LEDs6–10, perovskite-based LEDs11–13 and micro-LEDs14,15 have been championed to fabricate lightweight and flexible units for next-generation displays a...
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Open AccessSolvatochromic covalent organic frameworks
Covalent organic frameworks (COFs) are an emerging class of highly tuneable crystalline, porous materials. Here we report the first COFs that change their electronic structure reversibly depending on the surro...
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Chemical amplification of magnetic field effects relevant to avian magnetoreception
Magnetic fields as weak as the Earth's can change the yields of radical pair reactions even though the energies involved are orders of magnitude smaller than the thermal energy, kBT, at room temperature. Proposed...
