Efficient room-temperature phosphorescence based on a pure organic sulfur-containing heterocycle: folding-induced spin–orbit coupling enhancement

Liu, Haichao; Gao, Yu; Cao, Jungang; Li, Tingxuan; Wen, Yang; Ge, Yunpeng; Zhang, Lili; Pan, Guocui; Zhou, Tong; Yang, Bing

doi:10.1039/c8qm00320c

Cited by 72 publications

(52 citation statements)

References 84 publications

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“…Thianthrenes have attracted attention due to their high triplet formation yield and strong phosphorescent properties in the solid state. 1,2 Spin-orbit coupling interactions induced by the nπ* transitions and the heavy-atom effect caused by the presence of sulfur, lead to its remarkable phosphorescent properties. [3][4][5][6][7] As a result, thianthrene and its analogs are mediocre photoluminescence emitters in conditions where the triplet state is effectively quenched by the surrounding environment, i.e.…”

Section: Introductionmentioning

confidence: 99%

Observation of Dual Room Temperature Fluorescence–Phosphorescence in Air, in the Crystal Form of a Thianthrene Derivative

et al. 2018

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Thianthrenes have been nearly forgotten as phosphors in recent years, but are now coming back, showing their strong potential in luminescent applications. Here, we present a comprehensive photophysical study of a carbazolyl derivative of thianthrene in different matrices and environments. The diffusion of oxygen is slowed down in the rigid environment of thianthrene organic crystals suppressing their phosphorescence quenching, as well as triplet-triplet annihilation. This facilitates the observation of simultaneous fluorescence and phosphorescence emissions at room temperature, in air, giving origin to strong white luminescence. Moreover, the color coordinates of the dual fluorescence-phosphorescence white emission, which is observed only in rigid amorphous media and in crystals, can be tuned.

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Section: Introductionmentioning

confidence: 99%

Observation of Dual Room Temperature Fluorescence–Phosphorescence in Air, in the Crystal Form of a Thianthrene Derivative

et al. 2018

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“…Zuschriften at low temperature. [17] At 77 K, the lifetime of the delayed component of BrFlu À CBr solution is not very different from others.R elatively speaking, the phosphorescence lifetime of BrFlu À CBr crystals increases (see Figure S4d). After UV excitation off,B rFluÀCBr crystals showed more intense phosphorescence emission and as low decay rate in transient spectra (see Figure S5).…”

Section: Angewandte Chemiementioning

confidence: 85%

Bromine‐Substituted Fluorene: Molecular Structure, Br–Br Interactions, Room‐Temperature Phosphorescence, and Tricolor Triboluminescence

Wang

Gong

et al. 2018

Angewandte Chemie

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Organic tribophosphorescence materials are rarely reported and the introduction of Br atoms mayb eapractical way to design such materials.H ere four bromine-substituted fluorene-based derivatives are presented and BrFlu À CBr, having fluorescence-phosphorescence dual-emission induced not only by UV light but also by mechanical stimulus,manifests the highest phosphorescence efficiency of 4.56 %upon photoirradiation. During the grinding process,t hree different triboluminescent spectra were identified. Upon introduction of am echanical stimulus,t he triboluminescence emission is cyan, whereas after an extended period it changed to blue.After removing the mechanical stimulus,g reen-white phosphorescent emission was observed. Careful research on single-crystal structures and theoretical calculations demonstrate that strong Br···Br interactions are vital to facilitate spin-orbit coupling and promote intersystem crossing, thus generating the unique properties.

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“…Generally, the triplet utilization relies on the reversed intersystem crossing (RISC) process. Inspiring by the works on the room-temperature phosphorescence (RTP) materials, enhancing the spin-orbit coupling (SOC) can be a decent method to further accelerate the RISC for triplet utilization(Mao et al, 2015; Xu et al, 2016; Liu et al, 2018; Sun et al, 2018). Recently we have reported a singles-molecular white emissive material benzo[a, c]phenazine (DPPZ), which can realize a ternary emission of T 2 -RTP, T 1 -RTP, and S 1 -RTP (Figure 1) (Zhou et al, 2018b).…”

Section: Introductionmentioning

confidence: 99%

Modulation of Excited State Property Based on Benzo[a, c]phenazine Acceptor: Three Typical Excited States and Electroluminescence Performance

et al. 2019

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Throwing light upon the structure-property relationship of the excited state properties for next-generation fluorescent materials is crucial for the organic light emitting diode (OLED) field. Herein, we designed and synthesized three donor-acceptor (D-A) structure compounds based on a strong spin orbit coupling (SOC) acceptor benzo[a, c]phenazine (DPPZ) to research on the three typical types of excited states, namely, the locally-excited (LE) dominated excited state (CZP-DPPZ), the hybridized local and charge-transfer (HLCT) state (TPA-DPPZ), and the charge-transfer (CT) dominated state with TADF characteristics (PXZ-DPPZ). A theoretical combined experimental research was adopted for the excited state properties and their regulation methods of the three compounds. Benefiting from the HLCT character, TPA-DPPZ achieves the best non-doped device performance with maximum brightness of 61,951 cd m −2 and maximum external quantum efficiency of 3.42%, with both high photoluminescence quantum efficiency of 40.2% and high exciton utilization of 42.8%. Additionally, for the doped OLED, PXZ-DPPZ can achieve a max EQE of 9.35%, due to a suppressed triplet quenching and an enhanced SOC.

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Efficient room-temperature phosphorescence based on a pure organic sulfur-containing heterocycle: folding-induced spin–orbit coupling enhancement

Abstract: A novel mechanism of folding-induced spin–orbit coupling enhancement is responsible for the efficient room temperature phosphorescence of a thianthrene emitter.

Cited by 72 publications

References 84 publications

Observation of Dual Room Temperature Fluorescence–Phosphorescence in Air, in the Crystal Form of a Thianthrene Derivative

Observation of Dual Room Temperature Fluorescence–Phosphorescence in Air, in the Crystal Form of a Thianthrene Derivative

Bromine‐Substituted Fluorene: Molecular Structure, Br–Br Interactions, Room‐Temperature Phosphorescence, and Tricolor Triboluminescence

Modulation of Excited State Property Based on Benzo[a, c]phenazine Acceptor: Three Typical Excited States and Electroluminescence Performance

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