Photoresponsive Luminescence Switching of Metal‐Free Organic Phosphors Doped Polymer Matrices

Zang, Lixin; Shao, Wenhao; Kwon, Min Sang; Zhang, Zhiguo; J, Kim

doi:10.1002/adom.202000654

Cited by 40 publications

(30 citation statements)

References 39 publications

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“…39), and an inscribed sample showed a clear image in delayed emission after the excitation (group 1, element 6 in USAF test target, Supplementary Fig. 40) 48 . The absolute luminance of these films, excited under UV light (280 nm) at room temperature, remains distinguishable because of the afterglow which can be seen by naked eyes (Supplementary Table 3).…”

Section: Resultsmentioning

confidence: 98%

“…27). At the same time, SDP-doped poly(vinyl alcohol-co-ethylene) (PVA-co-PE) also exhibits obvious irradiation-enhanced phosphorescence emission, since PVA-co-PE is known to act as an oxygen barrier 47,48 . Meanwhile, SDP doped with polyvinyl acetate (PVAc) does not show irradiation-enhanced phosphorescence, because the absence of hydroxyl groups in the PVAc polymer prevents the formation of C-O-C covalent bonds under UV irradiation.…”

Section: Resultsmentioning

confidence: 99%

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Ultraviolet irradiation-responsive dynamic ultralong organic phosphorescence in polymeric systems

et al. 2021

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Room temperature phosphorescence (RTP) has drawn extensive attention in recent years. Efficient stimulus-responsive phosphorescent organic materials are attractive, but are extremely rare because of unclear design principles and intrinsically spin-forbidden intersystem crossing. Herein, we present a feasible and facile strategy to achieve ultraviolet irradiation-responsive ultralong RTP (IRRTP) of some simple organic phosphors by doping into amorphous poly(vinyl alcohol) matrix. In addition to the observed green and yellow afterglow emission with distinct irradiation-enhanced phosphorescence, the phosphorescence lifetime can be tuned by varying the irradiation period of 254 nm light. Significantly, the dynamic phosphorescence lifetime could be increased 14.3 folds from 58.03 ms to 828.81 ms in one of the obtained hybrid films after irradiation for 45 min under ambient conditions. As such, the application in polychromatic screen printing and multilevel information encryption is demonstrated. The extraordinary IRRTP in the amorphous state endows these systems with a highly promising potential for smart flexible luminescent materials and sensors with dynamically controlled phosphorescence.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Ultraviolet irradiation-responsive dynamic ultralong organic phosphorescence in polymeric systems

et al. 2021

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“…In the meanwhile, singlet oxygen can be consumed by oxidizing the polymer matrix [37]. Recently, some typical radiation-dependent RTP materials have been developed using polymethyl methacrylate (PMMA) as the oxygen consumption matrix [38][39][40][41]. However, there are still some issues that need to be solved.…”

Section: Introductionmentioning

confidence: 99%

Ultraviolet-activated long-lived room-temperature phosphorescence from small organic molecule-doped polymer systems

Wang

Zheng

et al. 2021

Sci. China Mater.

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Long-lived organic room-temperature phosphorescent (RTP) materials have attracted widespread attention because of their fantastic properties and application prospects. The current methods for developing RTP materials are mainly based on the synthesis of new chromophore molecules and crystallization engineering. However, there are great challenges in the preparation of new chromophore molecules and the use of crystalline materials. Herein, dynamic stimulus-responsive long-lived RTP systems with various emission colors are realized by doping organic chromophore molecules into polymer matrix prepared from vinyl acetate and acrylic acid. Through UV light irradiation, the growth process of long-lived RTP phenomena can be observed for up to 10 s. In particular, the phosphorescence intensity, lifetime, afterglow brightness, and quantum yield of one representative film (P2-M2) increase by 155, 262, 414, and 8 times after the irradiation, respectively. The unique photophysical phenomena are ascribed to the oxygen consumption characteristics of the polymer matrix under UV irradiation. Meanwhile, the information storage devices are prepared with these RTP systems. This work provides a strategy for achieving small organic molecule-doped polymer RTP systems that are easy to prepare, low-cost, and widely adaptable.

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“…1 listed a few representative POPs with halogen or chalcogen heavy atoms: Br [5][6][7][8][9][10][11][12][13][14][15] , I 16,17 , or Se 18,19 . The El-Sayed rule explains the necessity of ( , * ) -( , * ) transitions in promoting SOC 20 , and the utilization of carbonyl [5][6][7][8][9][10][11][12][13] , heterocyclic rings [21][22][23] (e.g. triazine in DPhCzT 21 ), and other moieties having rich non-bonding electrons (e.g.…”

mentioning

confidence: 99%

Heavy Atom Oriented Orbital Angular Momentum Manipulation in Metal-Free Organic Phosphors

Shao

Jiang

Zimmerman

et al. 2021

Preprint

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Metal-free purely organic phosphors (POPs) are emerging materials for display technologies, solid-state lighting, and chemical sensors. The past decade has seen the promising utility of the El-Sayed rule and heavy atom effects in the design of POPs, and efficient matrix engineering to boost emission efficiencies. However, due to limited contemporary design strategies, the intrinsic spin-orbit coupling (SOC) efficiency of POPs remains low and their emission lifetime is pinned in the millisecond-second regime. Here, we report a universally applicable methodology to synergistically manipulate the main descriptors in SOC - heavy atom effect and orbital angular momentum, assisted by a novel set of natural-transition-orbital-based computation methods to visualize angular momentum descriptors in molecular design. Prototype POPs with efficient room-temperature phosphorescence were designed with SOC efficiencies boosted beyond 102 cm‑1 and lifetime pushed below the millisecond regime. Experimental verification for our novel design rule was conducted through systematic computation-assisted design achieving discrete tuning of heavy atom effects and orbital angular momentum.

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Photoresponsive Luminescence Switching of Metal‐Free Organic Phosphors Doped Polymer Matrices

Cited by 40 publications

References 39 publications

Ultraviolet irradiation-responsive dynamic ultralong organic phosphorescence in polymeric systems

Ultraviolet irradiation-responsive dynamic ultralong organic phosphorescence in polymeric systems

Ultraviolet-activated long-lived room-temperature phosphorescence from small organic molecule-doped polymer systems

Heavy Atom Oriented Orbital Angular Momentum Manipulation in Metal-Free Organic Phosphors

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