Post-synthesis of Lewis acid-base adducts as thermally activated delayed fluorescence radical emitters for color-tunable displays and encryption via inkjet printing

Liu, Hengjia; Tang, Yang; Ao, Ying; Gao, Yuhan; Chen, Xiaoyun; Zhou, Ling; Lin, Jinliang; Xie, Guohua

doi:10.1016/j.cej.2022.136642

Cited by 6 publications

(9 citation statements)

References 40 publications

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“…14 In order to acquire the good film morphology of LABAs, we optimized the process of fiml-formation by designing a suitable seeding layer, rationally tuning the solvent system of the ink, and controlling the substrate heating conditions. 23 We selected PVK as an additive for the small-molecular seeding layer of the Lewis base to the reduce film roughness and slightly changed the solvent resistance. The binary solvent system, i.e., chlorobenzene and cyclohexanone, was used to regulate an appropriate Z value which guaranteed the solution to form the stable and uniform droplets.…”

Section: Morphology Optimizationmentioning

confidence: 99%

“…We successfully fabricated the sophisticated QR code patterns and color-tunable letters via in situ post-synthesis assisted and controlled by inkjet printing. 23 For instance, by controlling the printing times of the diluted BCF ink at a fixed concentration onto the Lewis-base film with the deep-blue fluorescence DTSF-2-DP-TRZ, the emissive colors of the encoded patterns and the letters gradually bathochromic-shifted from bluish-green to orange-red under UV light, which was ascribed to the dose of BCF dominated generation of the luminescent LABAs. 23 The encrypted information could only be authenticated by the external stimuli of UV light.…”

Section: In Situ Process For Anticounterfeiting and Encryption Applic...mentioning

confidence: 99%

“…23 For instance, by controlling the printing times of the diluted BCF ink at a fixed concentration onto the Lewis-base film with the deep-blue fluorescence DTSF-2-DP-TRZ, the emissive colors of the encoded patterns and the letters gradually bathochromic-shifted from bluish-green to orange-red under UV light, which was ascribed to the dose of BCF dominated generation of the luminescent LABAs. 23 The encrypted information could only be authenticated by the external stimuli of UV light. Furthermore, since the LABAs with different amounts of BCF exhibited different delayed lifetimes, more applications of the analogues in the timegated encryption are envisaged and conceivable.…”

Section: In Situ Process For Anticounterfeiting and Encryption Applic...mentioning

confidence: 99%

“…We successfully fabricated the sophisticated QR code patterns and color-tunable letters via in situ post-synthesis assisted and controlled by inkjet printing. 23…”

Section: In Situ Process For Anticounterfeiting and Encryption Applic...mentioning

confidence: 99%

“…As a proof-of-concept, the fluorescent molecule containing spirodifluorene and 1,3,5-triazine moieties, namely DTSF-2-DP-TRZ, and an aryl borane (BCF) were employed as the Lewis base and Lewis acid, respectively. 23 A novel strategy of in situ post-synthesis based on fast Lewis acid–base interaction has been proposed by our group (see Fig. 3).…”

Section: Introductionmentioning

confidence: 99%

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In situpost-synthesis of luminescent Lewis acid–base adducts

Xue

Xie

2023

Chem. Commun.

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Section: Morphology Optimizationmentioning

confidence: 99%

Section: In Situ Process For Anticounterfeiting and Encryption Applic...mentioning

confidence: 99%

Section: In Situ Process For Anticounterfeiting and Encryption Applic...mentioning

confidence: 99%

“…We successfully fabricated the sophisticated QR code patterns and color-tunable letters via in situ post-synthesis assisted and controlled by inkjet printing. 23…”

Section: In Situ Process For Anticounterfeiting and Encryption Applic...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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In situpost-synthesis of luminescent Lewis acid–base adducts

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Thermally Activated Delayed Fluorescence and Room‐Temperature Phosphorescence in Sulfidoazatriangulene‐Based Materials and their S‐oxides

Elgadi

Mayder

Hojo

et al. 2023

Advanced Optical Materials

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with higher-lying triplet states. [9] TADF behavior can be observed if the energy gap between T 1 and S 1 (ΔE ST ) is sufficiently small. This requires minimization of the electron exchange interaction, which is typically achieved by spatial separation of a material's frontier molecular orbitals (HOMO and LUMO). The ability to productively harvest triplet excitons in allorganic systems has unlocked many new applications for TADF and RTP materials, including photocatalysts, [10][11][12][13] luminescent sensors, [14][15][16][17][18] tools for information encryption, [19][20][21][22][23] bioimaging probes, [24][25][26][27] and emitters for electroluminescent devices.Despite their advantages, many donoracceptor (D-A) TADF compounds exhibit poor photostability and low color purity, hindering their practical use. Triarylamines in particular are often the cause of poor stability in these systems, despite being the most common π-electron donors used in TADF materials today. The cleavage of C(sp 2 )N(sp 2 ) bonds is a common degradation mechanism in triarylamine-containing organic semiconductors, [28] and few triphenylamine radical cations are known to be stable. [29] As a result, the identification of new electron donors with improved photophysical properties remains a critical need.Rigidified electron donors such as hexamethylazatriangulene (HMAT) have recently been used to give TADF materials with improved photoluminescence quantum yields, narrower emission spectra, higher two-photon cross sections, and improved photostability. [30][31][32][33] These outcomes are achieved by reducing vibrational and rotational degrees of freedom, giving improved properties that are almost universally desirable in optoelectronics. This approach was described by Brédas in 2017 by combining triazine (TRZ) as a weak acceptor with the HMAT donor, giving the green emitter HMAT-TRZ (Figure 1). [33] In spite of a small D-A dihedral angle and a large ΔE ST (0.38 eV), this material displays TADF in doped poly(methylmethacrylate) (PMMA) films. Several more coplanar D-A TADF materials have since been reported, exhibiting enhanced PLQY, color purity, and molar absorptivity as a consequence of molecular rigidity. [31,32,34,35] These advances motivated us to seek new rigidified moieties for the design of high-performance TADF and RTP materials. In 2019, Lacquai and Kato simultaneously described an S,C,C-bridged triphenylamine (SMAT), and demonstrated Structural constraint is an emerging strategy for improving the photoluminescence quantum yield, molar absorptivity, and color purity of luminescent materials. In this report, emitters displaying thermally activated delayed fluorescence (TADF) are achieved for the first time using the planarized donor sulfidotetramethyazatriangulene (SMAT). Compared to non-planarized phenothiazine (PTZ) donors, the enhanced rigidity of SMAT contributes to improved color purity and photoluminescence quantum yield, with up to 90% quantum yield observed for donor-acceptor compounds in toluene solution. Planarized SMAT-base...

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