A Class of Organic Units Featuring Matrix‐Controlled Color‐Tunable Ultralong Organic Room Temperature Phosphorescence

Xue, Zheng; Qian, Chen; Ma, Zhimin; Fu, Xiaohua; Li, Zewei; Jin, Huiwen; Chen, Mingxing; Jiang, Hong; Ma, Zhiyong

doi:10.1002/advs.202206482

Cited by 35 publications

(20 citation statements)

References 49 publications

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“…According to pioneers’ work ,,, and our previous work, − this study further confirms the charge separation and charge recombination mechanism for guest-matrix ultralong organic phosphorescence. As shown in Figure b, the guest is firstly excited from ground state to the singlet locally excited state.…”

Section: Resultssupporting

confidence: 86%

“…Several donor–acceptor (D–A) type molecules with 4-iodo-diphenylsulfone as the acceptor and a phosphorescence unit as the donor were obtained via a typical substitution reaction. To fully exclude the impurity influence, N -(2-naphthyl)aniline (N-2), 5 H -benzo[ c ]carbazole (BCz-1), and carbazole were synthesized in the lab according to our previous work. ,, 7 H -Benzo[ c ]carbazole (BCz-2) was from a commercial company but was further purified before use. The four synthesized targeted molecules were named as ISO2N-2, ISO2BCz-1, ISO2BCz-2, and ISO2Cz.…”

Section: Resultsmentioning

confidence: 99%

“…In 2021, we for the first time successfully synthesized Bd in the lab and systematically investigated the UOP properties of Bd and its derivatives. , Then, we found a readily obtained alternative to Bd, named as 5 H -benzo[ b ]carbazole (BCz-1), which paved a simple way for the research and application of UOP. Furthermore, we reported a class of naphthylamine-structured organic units (N-1 and N-2) and their derivatives featuring matrix-controlled color-tunable RTUOP . Recently, we found another building block, 7 H -benzo[ c ]carbazole (BCz-2), which can be used to construct RTUOP powders and films, and discovered that the afterglow color can change gradually in a single matrix.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, we found another building block, 7 H -benzo[ c ]carbazole (BCz-2), which can be used to construct RTUOP powders and films, and discovered that the afterglow color can change gradually in a single matrix. Comparing Bd, BCz-1, N-1, N-2, and BCz-2, it is easy to find several similarities for their UOP properties: − (1) photoactivated room temperature afterglow in the PMMA film; (2) intense RTUOP can be realized when they and their derivatives are doped into powder matrixes; (3) charge separation and charge recombination are involved in the UOP emitting process of their doped systems; (4) donor–acceptor structures facilitate the ISC process and boost the phosphorescence efficiency. In this regard, Bd, BCz-1, N-1, N-2, and BCz-2 can be defined as “phosphorescence units”.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

How Matrixes Influence Room Temperature Ultralong Organic Phosphorescence: 4-Dimethylaminopyridine vs Carbazole Derivative

Jin

et al. 2023

ACS Appl. Mater. Interfaces

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How matrixes influence room temperature ultralong organic phosphorescence (RTUOP) in the doping systems is a fundamental question. In this study, we construct guest-matrix doping phosphorescence systems by using the derivatives (ISO2N-2, ISO2BCz-1, and ISO2BCz-2) of three phosphorescence units (N-2, BCz-1, and BCz-2) and two matrixes (ISO2Cz and DMAP) and systematically investigate their RTUOP properties. Firstly, the intrinsic phosphorescence properties of three guest molecules were studied in solution, in the pure powder state, and in PMMA film. Then, the guest molecules were doped into the two matrixes with increasing weight ratio. To our surprise, all of the doping systems in DMAP feature a longer lifetime but weaker phosphorescence intensity, while all of the doping systems in ISO2Cz exhibit a shorter lifetime but higher phosphorescence intensity. According to the single-crystal analysis of the two matrixes, resemblant chemical structures of the guests and ISO2Cz enable them to approach each other and interact with each other via a variety of interactions, thus facilitating the occurrence of charge separation (CS) and charge recombination (CR). The HOMO-LUMO energy levels of the guests match well with the ones of ISO2Cz, which also significantly promotes the efficiency of the CS and CR process. To our best knowledge, this work is a systematic study on how matrixes influence the RTUOP of guest-matrix doping systems and may give deep insight into the development of organic phosphorescence.

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Section: Resultssupporting

confidence: 86%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

How Matrixes Influence Room Temperature Ultralong Organic Phosphorescence: 4-Dimethylaminopyridine vs Carbazole Derivative

Jin

et al. 2023

ACS Appl. Mater. Interfaces

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“…In this regard, Bd is the most important phosphorescence unit and behaves as a standard. As the synthesis of Bd is rather tedious and greatly limits its future applications, exploring new phosphorescence units, , which can be obtained readily, is of great significance.…”

Section: Introductionmentioning

confidence: 99%

Selective Expression of Organic P hosphorescence Units: When H-Benzo[f]indole Meets 7H-Benzo[c]carbazole

Xue

Qian

et al. 2023

Chem. Mater.

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Phosphorescence selective expression in the development of ultralong organic room-temperature phosphorescence (UORTP) materials to enrich the properties and functions of smart materials is a very interesting topic but has not been realized yet due to the lack of organic phosphorescence units. In this work, we, for the first time, investigate the selective expression phenomenon of two organic phosphorescence units in a single molecule. First, we report a new phosphorescence unit 7H-benzo[c]carbazole (BCz) with the advantage of simple synthesis. BCz derivatives (PNBCz-1 and PNBCz-2) feature photoactivated green ultralong phosphorescence in the PMMA film at room temperature, and cation radicals are involved in the unique ultralong phosphorescence behavior, which is similar to H-benzo[f]indole (Bd) derivatives. Different from Bd, pure powders of BCz derivatives show intense red-shifted ultralong phosphorescence at 77 K, probably due to the extended π conjugated structure of BCz. Then, BCz and Bd were incorporated into a single skeleton and two asymmetric molecules (PNBCzBd-1 and PNBCzBd-2) were obtained. Surprisingly, in the PMMA film, PNBCzBd-1 and PNBCzBd-2 both show photoactivated yellow ultralong phosphorescence at room temperature assigned to the intrinsic phosphorescence emission of Bd, and intrinsic green phosphorescence of BCz is almost screened by Bd. Density functional theory (DFT) calculations reveal that the incorporation of Bd leads to the shifting of the phosphorescence emission centers from BCz units to Bd units. Therefore, the intrinsic phosphorescence emission of Bd is selectively expressed in the case of PNBCzBd-1 and PNBCzBd-2. To our best knowledge, this is the first example that reports the selective expression behavior of organic phosphorescence units. We believe that this study may impact the future research of UORTP materials and lay the foundation for their future applications.

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Light‐Induced Electron Transfer Toward On/Off Room Temperature Phosphorescence in Two Photochromic Coordination Polymers

Feng

et al. 2023

Adv Funct Materials

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Photoswitchable room temperature phosphorescence (RTP) materials are of great interest due to their potential applications in optical devices and switches. Herein, two Zn‐based coordination polymers (CPs) (H3‐TPB)·[Zn6(H‐HEDP)(HEDP)3(H2O)2]·5H2O (complex 1; HEDP = hydroxyethylidene diphosphonate; TPB = 1,3,5‐tris(4‐pyridyl)benzene) and (H‐TPB)·[Zn3(H‐HEDP)(HEDP)(H2O)]·2H2O (complex 2) with distinguishable photochromism and tunable RTP are synthesized involving photoactive TPB molecules with different packing modes. Complex 1 exhibits bidirectionally on/off RTP regulation via on‐switch with excitation of 250−330 nm light and off‐switch with 350−380 nm, and the “turn‐on” behavior can be attributed to the advance of Förster resonance energy transfer‐assisted intersystem crossing (ISC) process while “turn‐off” process due to the transformation from H3‐TPB cations to H3‐TPB· radicals. Complex 2 exhibits photoswitchable RTP accompanied with reversible photochromism by leveraging the self‐absorption and RTP emission. Two demos based on the above compounds are further applied to demonstrate the application in information recording and encryption fields. This work supplies a strategy toward the design of switchable RTP systems using electron transfer photochromism, shedding light on broadening the frontiers of photoresponsive materials.

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A Class of Organic Units Featuring Matrix‐Controlled Color‐Tunable Ultralong Organic Room Temperature Phosphorescence

Cited by 35 publications

References 49 publications

How Matrixes Influence Room Temperature Ultralong Organic Phosphorescence: 4-Dimethylaminopyridine vs Carbazole Derivative

How Matrixes Influence Room Temperature Ultralong Organic Phosphorescence: 4-Dimethylaminopyridine vs Carbazole Derivative

Selective Expression of Organic P hosphorescence Units: When H-Benzo[f]indole Meets 7H-Benzo[c]carbazole

Light‐Induced Electron Transfer Toward On/Off Room Temperature Phosphorescence in Two Photochromic Coordination Polymers

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