Luminescence properties of 5-Bromoindole in PVA films at room temperature: Direct triplet state excitation

Chavez, Jose; Kimball, Joseph; Ceresa, Luca; Kitchner, Emma; Shtoyko, Tanya; Fudala, Rafał; Borejdo, Julian; Gryczyński, Zygmunt; Gryczyński, Ignacy

doi:10.1016/j.jlumin.2020.117724

Cited by 12 publications

(7 citation statements)

References 27 publications

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“…Recently our research group, as well as others, investigated room temperature phosphorescence (RTP) from indole derivatives embedded in poly (vinyl alcohol) (PVA) films [1][2][3][4][5]. Interestingly, we were able to excite triplet states of these compounds directly with blue light.…”

Section: Introductionmentioning

confidence: 99%

Direct excitation of tryptophan phosphorescence. A new method for triplet states investigation

Chavez¹,

Ceresa²,

Reeks³

et al. 2022

Methods Appl. Fluoresc.

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We studied room temperature phosphorescence of tryptophan (TRP) embedded in poly (vinyl alcohol) films. With UV (285 nm) excitation, the phosphorescence spectrum of tryptophan appears at about 460 nm. We also observed the TRP phosphorescence with blue light excitation at 410 nm, well outside of the S0→S1 absorption. This excitation reaches the triplet state of tryptophan directly without the involvement of the singlet excited state. The phosphorescence lifetime of tryptophan is in the sub-millisecond range. The long-wavelength direct excitation to the triplet state results in high phosphorescence anisotropy which can be useful in macromolecule dynamics study via time-resolved phosphorescence.

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Section: Introductionmentioning

confidence: 99%

Direct excitation of tryptophan phosphorescence. A new method for triplet states investigation

Chavez¹,

Ceresa²,

Reeks³

et al. 2022

Methods Appl. Fluoresc.

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“…Organic room temperature phosphorescence (ORTP) materials give light at room temperature and are promising candidates in many innovative applications, − such as bioimaging and diagnostics, − advanced encryption, , anticounterfeiting, optical recording and information storage, and organic light-emitting diodes (OLED). ,− It is well-known that the effective intersystem crossing (ISC) process between excited singlet state and triplet state and suppressed nonradiative decay are two important factors to generate excellent ORTP. One kind of strategy is used to boost spin–orbital coupling (SOC) for promoting the ISC process by introducing heavy atoms, heteroatoms, halogen bond incorporation, singlet fission, and intermolecular charge transfer (ICT). − The other strategies are used to suppress nonradiative relaxation of excited triplet state by constituting H-aggregation, , crystal engineering, − intermolecular interactions, ,, and host–guest systems. − The host–guest strategies have drawn significant attention in recent investigations due to the advantages of low cost, molecular diversity, simple preparation, and flexible modulation properties. − Basically, the host molecules can play the role of confining the guest molecules, thus suppressing the nonradiative relaxation. ,− At the same time, the host molecules are supposed to help the excimer transfer of guest molecules. − Along with the development of host–guest ORTP materials, molecule pairs possessing donor–acceptor properties show exceptional efficiency and luminescent lifetime. , H...…”

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confidence: 99%

Construction and Application of Large Stokes-Shift Organic Room Temperature Phosphorescence Materials by Intermolecular Charge Transfer

Yang

Deng

et al. 2023

J. Phys. Chem. Lett.

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Notably, the intermolecular charge transfer between pyrene (Py) and benzophonenes (BPs) can significantly enhance the quantum yield of the triplet state of Py, which will convert Py from a fluorescence molecule to a phosphorescence molecule. The intermolecular charge transfer is confirmed by steady-state and time-resolved spectroscopy and theoretical study. Based on these foundations, Py is doped into BPs systems and a large Stokes-shift organic room temperature phosphorescence (ORTP) is observed. By using different benzophenone derivatives, a series of host–guest ORTP materials with different luminescent properties adjusted by intermolecular charge transfer features are developed. Fortunately, these host–guest ORTP systems from benzophenone derivatives and pyrene are readily fabricated, and the red gradient color lasting as long as 3 s is observed after removing UV excitation. This host–guest charge transfer strategy plays an important role in the mechanism of the luminous type shift. Our strategy paves the way to design ORTP materials conveniently and apply these materials in encryption and temperature alarm device.

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“…Polyvinyl Alcohol: PVA with excellent water-solubility, good oxygen barrier properties as well as high flexibility and tensile strength, [70,201] holds enormous potential in serving as universal host matrix to construct host-guest RTP material systems because of the efficient intermolecular interactions between mass of hydroxyl groups and carboxyl, amino and polar functional groups to prohibit the nonradiative transition process and oxygen/ humidity quenching of the triplet excitons. In 2012, Al-Attar and Monkman [202] reported a new strategy of thermally open-close caging (TOCC) to prepare thin RTP films with perfectly isolated dense luminescent polymer chains through doping water-soluble conjugated polymer (G181) into PVA host.…”

Section: Polymer Matrixmentioning

confidence: 99%

“…[62][63][64][65][66][67] Among them, the host-guest doping method has attracted widespread attention and was found to have the most remarkable progress in recent investigations owing to the intrinsic advantages including simple material preparation, low-cost, a versatile resource of molecular structure, and controllably modulated properties of the host-guest RTP system. [68][69][70][71][72][73][74][75] Particularly, the inherent amorphous attribute of host-guest RTP material system enables great feasibility in fabricating the practical applications. As research continues to progress in this area, we would not be surprised if breakthroughs in host-guest RTP are forthcoming, promoting the emergence of a new generation of organic optoelectronic materials and posing profound impacts on the future development of organic electronics.…”

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confidence: 99%

Recent Advances on Host–Guest Material Systems toward Organic Room Temperature Phosphorescence

Yan

Peng

Yuan

et al. 2021

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The design and characterization of purely organic room‐temperature phosphorescent (RTP) materials for optoelectronic applications is currently the focus of research in the field of organic electronics. Particularly, with the merits of preparation controllability and modulation flexibility, host–guest material systems are encouraging candidates that can prepare high‐performance RTP materials. By regulating the interaction between host and guest molecules, it can effectively control the quantum efficiency, luminescent lifetime, and color of host–guest RTP materials, and even produce RTP emission with stimuli‐responsive features, holding tremendous potential in diverse applications such as encryption and anti‐counterfeiting, organic light‐emitting diodes, sensing, optical recording, etc. Here a roundup of rapid achievement in construction strategies, molecule systems, and diversity of applications of host–guest material systems is outlined. Intrinsic correlations between the molecular properties and a survey of recent significant advances in the development of host–guest RTP materials divided into three systems including rigid matrix, exciplex, and sensitization are presented. Providing an insightful understanding of host–guest RTP materials and offering a promising platform for high throughput screening of RTP systems with inherent advantages of simple material preparation, low‐cost, versatile resource, and controllably modulated properties for a wide range of applications is intended.

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Luminescence properties of 5-Bromoindole in PVA films at room temperature: Direct triplet state excitation

Cited by 12 publications

References 27 publications

Direct excitation of tryptophan phosphorescence. A new method for triplet states investigation

Direct excitation of tryptophan phosphorescence. A new method for triplet states investigation

Construction and Application of Large Stokes-Shift Organic Room Temperature Phosphorescence Materials by Intermolecular Charge Transfer

Recent Advances on Host–Guest Material Systems toward Organic Room Temperature Phosphorescence

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