Thermally activated singlet exciton fission observed in rubrene doped organic films

Zhang, Yong; Lei, Yanlian; Zhang, Qiaoming; Xiong, Zuhong

doi:10.1016/j.orgel.2013.12.010

Cited by 24 publications

(26 citation statements)

References 29 publications

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“…The doping concentration was about 3% by weight ratio. Supposing that the doped rubrene molecules were almost uniformly distributed in the NPB matrix, the averaged intermolecular distance between adjacent rubrene molecules could be estimated to be about 2.9 nm [20]. Although the height of fluorescence peak around 565 nm slightly rose when temperature was decreased, actually the area under each spectral line was almost constant.…”

Section: Resultsmentioning

confidence: 97%

“…The minimal pulse width of excitation was about 800 ps. When measuring the MPL effect in steady-state, rubrene samples were mounted on the cold finger of another cryostat which was located between the pole pieces of an electromagnet [20]. Photoluminescence from rubrene films was excited by using a semiconductor laser with 405 nm wavelength.…”

Section: Contents Lists Available At Sciencedirectmentioning

confidence: 99%

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Temperature-dependent singlet exciton fission observed in amorphous rubrene films

Chen

Zhang

et al. 2015

Organic Electronics

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Section: Resultsmentioning

confidence: 97%

Section: Contents Lists Available At Sciencedirectmentioning

confidence: 99%

Temperature-dependent singlet exciton fission observed in amorphous rubrene films

Chen

Zhang

et al. 2015

Organic Electronics

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“…This variation is represented by a change in the singlet fission rate, which in turn, results in a modification of the observed prompt and delayed fluorescence. [32,35] Here we show that magnetic photoluminescence offers a convenient method of measuring magnetic fields that are present in the local sample environment. By imaging the photoluminescence of an organic thin film of material exhibiting MPL we show that it is possible to visualize the magnetic stray field of permanent magnets lying close behind the film substrate.…”

Section: Introductionmentioning

confidence: 80%

“…[30,35,48,49] These were thermally evaporated (base pressure ≈5 × 10 −5 Pa) onto Si (001) and quartz substrates (lateral dimensions ≈40 × 40 mm 2 ) at a rate of 1.5 nm s −1…”

Section: Methodsmentioning

confidence: 99%

“…It has been observed to exceed 20% in some materials and tends to display a nonlinear response with magnetic field. [34,35] MPL is described by singlet exciton fission. [36] This phenomenon arises due to the coupling of a molecule in the electronic singlet ground state S 0 with a nearby molecule in the first excited singlet state S 1 to form a "correlated triplet-pair state" 1 (TT), at a rate proportional to the rate constant k −2 , which can then go on to dissociate into separate triplet states T 1 , described by…”

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confidence: 99%

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Wide Field Magnetic Luminescence Imaging

Hodges

Grell

Morley

et al. 2017

Adv Funct Materials

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This study demonstrates how magnetic-field-dependent luminescence from organic films can be used to image the magnetic configuration of an underlying sample. The organic semiconductors tetracene and rubrene exhibit singlet exciton fission, which is a process sensitive to magnetic fields. Here, thin films of these materials were characterized using photoluminescence spectrometry, atomic force microscopy, and photoluminescence magnetometry. The luminescence from these substrate-bound thin films is imaged to reveal the magnetic configuration of underlying Nd-Fe-B magnets. The tendency of rubrene to form amorphous films and produce large changes in photoluminescence under an applied magnetic field makes it more appropriate for magnetic field imaging than tetracene. This demonstration can be extended in the future to allow simple microscopic imaging of magnetic structure.

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Magnetic Field Effect in Organic Light‐Emitting Diodes Based on Electron Donor–Acceptor Exciplex Chromophores Doped with Fluorescent Emitters

Baniya

Pang

Sun

et al. 2016

Adv Funct Materials

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A new type of organic light‐emitting diode (OLED) has emerged that shows enhanced operational stability and large internal quantum efficiency approaching 100%, which is based on thermally activated delayed fluorescence (TADF) compounds doped with fluorescent emitters. Magneto‐electroluminescence (MEL) in such TADF‐based OLEDs and magneto‐photoluminescence (MPL) in thin films based on donor–acceptor (D–A) exciplexes doped with fluorescent emitters with various concentrations are investigated. It has been found that both MEL and MPL responses are thermally activated with substantially lower activation energy compared to that in the pristine undoped D–A exciplex host blend. In addition, both MPL and MEL steeply decrease with the emitter's concentration. This indicates the existence of a loss mechanism, whereby the triplet charge‐transfer state in the exciplex host blend may directly decay to the lowest, nonemissive triplet state of the fluorescent emitter molecules.

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Thermally activated singlet exciton fission observed in rubrene doped organic films

Cited by 24 publications

References 29 publications

Temperature-dependent singlet exciton fission observed in amorphous rubrene films

Temperature-dependent singlet exciton fission observed in amorphous rubrene films

Wide Field Magnetic Luminescence Imaging

Magnetic Field Effect in Organic Light‐Emitting Diodes Based on Electron Donor–Acceptor Exciplex Chromophores Doped with Fluorescent Emitters

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