Fabrication-method Independence of Organic Long-persistent Luminescence Performance

Jinnai, Kazuhiko; Nishimura, Naohiro; Kabe, Ryota; Adachi, Chihaya

doi:10.1246/cl.180949

Cited by 23 publications

(25 citation statements)

References 21 publications

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“…OLPL materials. The OLPL systems were fabricated by the meltcasting of a mixture containing 1% of an electron donor and 99% of an electron acceptor 7 . The electron donors, TMB, N,N'dimethyl-N,N'-ditolylbenzidine (DMDTB), and N,N,N′,N′-tetratolylbenzidine (TTB), and the electron acceptor, 2,8-bis(diphenylphosphoryl)dibenzo[b,d]thiophene (PPT), are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Film fabrication. Thick films (0.4 mm) for the optical measurement were fabricated by a melt-casting method 7 . Mixed materials were heated up the melting point of the acceptor (250°C) in a nitrogen-filled glovebox.…”

Section: Methodsmentioning

confidence: 99%

“…Recently, we realized the LPL emission from purely organicbased materials, including organic small molecules and polymers 5,6 . These organic LPL (OLPL) materials can be easily fabricated by mixing an electron donor and an electron acceptor using various methods such as melt-casting, spin coating, or thermal evaporation 7 . Moreover, the emission color of OLPL systems can be controlled by the addition of dopants 8 .…”

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confidence: 99%

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Influence of energy gap between charge-transfer and locally excited states on organic long persistence luminescence

et al. 2020

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Organic long-persistent luminescence (LPL) is an organic luminescence system that slowly releases stored exciton energy as light. Organic LPL materials have several advantages over inorganic LPL materials in terms of functionality, flexibility, transparency, and solutionprocessability. However, the molecular selection strategies for the organic LPL system still remain unclear. Here we report that the energy gap between the lowest localized triplet excited state and the lowest singlet charge-transfer excited state in the exciplex system significantly controls the LPL performance. Changes in the LPL duration and spectra properties are systematically investigated for three donor materials having a different energy gap. When the energy level of the lowest localized triplet excited state is much lower than that of the charge-transfer excited state, the system exhibits a short LPL duration and clear two distinct emission features originating from exciplex fluorescence and donor phosphorescence.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Influence of energy gap between charge-transfer and locally excited states on organic long persistence luminescence

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“…In addition to the higher material costs of these rare‐earth metals, many inorganic LPLs require harsh synthetic procedures, [ 11 ] further increasing research costs. Organic LPL (OLPL) materials, [ 12–16 ] offer the promise of a multitude of benefits: easier synthesis, easier modification for targeted functionality, and easier processing. However, the development of OLPL materials has encountered many obstacles.…”

Section: Figurementioning

confidence: 99%

Two Are Better Than One: A Design Principle for Ultralong‐Persistent Luminescence of Pure Organics

et al. 2020

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drawbacks. In addition to the higher material costs of these rare-earth metals, many inorganic LPLs require harsh synthetic procedures, [11] further increasing research costs. Organic LPL (OLPL) materials, [12][13][14][15][16] offer the promise of a multitude of benefits: easier synthesis, easier modification for targeted functionality, and easier processing. However, the development of OLPL materials has encountered many obstacles. To access long lived states in organic compounds, there have been many designs to exploit the excited triplet state. Though access to and from the triplet state is a forbidden process and once thought to be too inefficient for effective use at room temperature, [17] recent advances have vastly increased intersystem crossing efficiency by enhancing spin-orbit coupling (SOC) with the use of heteroatoms, [18,19] the carbonyl functional group, [20][21][22] heavy atom effects, [23][24][25][26][27] and multimer-enhanced intersystem crossing. [28][29][30][31][32] Equally important is protecting the long-lived triplet after its generation, due to the fact that they are particularly sensitive to molecular vibrational quenching and atmospheric oxygen. In this regard, recent works have accomplished this through the use of crystals, [33,34] metal-organic frameworks, [35] H-aggregation, [36] and others. [30,32,37] Although there have been many achievements in generating organic room-temperature Because of their innate ability to store and then release energy, longpersistent luminescence (LPL) materials have garnered strong research interest in a wide range of multidisciplinary fields, such as biomedical sciences, theranostics, and photonic devices. Although many inorganic LPL systems with afterglow durations of up to hours and days have been reported, organic systems have had difficulties reaching similar timescales. In this work, a design principle based on the successes of inorganic systems to produce an organic LPL (OLPL) system through the use of a strong organic electron trap is proposed. The resulting system generates detectable afterglow for up to 7 h, significantly longer than any other reported OLPL system. The design strategy demonstrates an easy methodology to develop organic long-persistent phosphors, opening the door to new OLPL materials.Long-persistent luminescent [1,2] (LPL) materials have demonstrated great potential and performance in multiple areas, such as life sciences, [3] the biomedical field, [2,4] and photo voltaics, [5] as they offer fascinating possibilities for their ability to store and slowly release excited state energy. For example in biomedical applications, LPL materials can be used postexcitation, overcoming any issue of autofluorescence. [6][7][8] Currently, the most successful LPL materials make use of transition and rare-earth metal ions. [9,10] Although the metals grant exceptionally long afterglows that range from minutes to hours, with some systems lasting days and weeks, [11] they are not without their inherentThe ORCID identification number(s) for the aut...

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“…[ 16 ] This OLPL system can be fabricated using not only a low‐temperature melt‐casting method, but also thermal evaporation and spin‐coating methods. [ 17 ] Moreover, the emission color of OLPL can be controlled by tuning the highest occupied molecular orbital (HOMO) level of the donor or energy transfer from exciplexes to extra‐emitter dopants. [ 15,18 ] Furthermore, a transparent and flexible OLPL system can be realized by using a polymer‐based acceptor.…”

Section: Introductionmentioning

confidence: 99%

Many Exciplex Systems Exhibit Organic Long‐Persistent Luminescence

Nishimura

Lin

Jinnai

et al. 2020

Adv Funct Materials

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Fabrication-method Independence of Organic Long-persistent Luminescence Performance

Cited by 23 publications

References 21 publications

Influence of energy gap between charge-transfer and locally excited states on organic long persistence luminescence

Influence of energy gap between charge-transfer and locally excited states on organic long persistence luminescence

Two Are Better Than One: A Design Principle for Ultralong‐Persistent Luminescence of Pure Organics

Many Exciplex Systems Exhibit Organic Long‐Persistent Luminescence

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