Achieving diversified emissive behaviors of AIE, TADF, RTP, dual-RTP and mechanoluminescence from simple organic molecules by positional isomerism

Abstract

Organic emitters with multiple emissions such as aggregation-induced emission (AIE), thermally activated delayed fluorescence (TADF), room-temperature phosphorescence (RTP), and mechanoluminescence (ML) are promising candidates for various high-tech applications but still...

Synthesis and excited state modulation of organic blue light emitters based on 2,4,6-triphenyl-1,3,5-triazine and carbazole derivatives through ortho-positioned linking models

“…Interestingly, there are two long-wavelength emission peaks at 550 nm and 600 nm for the emitter OSTrPhCz, which can be assigned to the radiative transition from the stabilized T m states populated by different aggregate states. 44 Since the emitters OTrPhCz show blue light emission with relatively higher PLQYs, we prepared blue OLED devices based on emitters OTrPhCz with two doping concentrations in weight by spin coating methods, and the device structures are ITO/PEDOT:PSS/ 2,6-bis(3-(9H-carbazol-9-yl)phenyl)pyridine:(OTrPhCz (10%/20%))/ TPBI (35 nm)/Ca:Ag, and 2,6-bis(3-(9H-carbazol-9-yl)phenyl) pyridine was used as the host of the emitters OTrPhCz. As shown in Fig.…”

“…Interestingly, there are two long-wavelength emission peaks at 550 nm and 600 nm for the emitter OSTrPhCz , which can be assigned to the radiative transition from the stabilized T m states populated by different aggregate states. 44…”

Principles, properties, and sensing applications of mechanoluminescence materials

“…80 Xiong et al proposed an effective position isomerization strategy and obtained simple organic isomers with various luminescent behaviors such as AIE, TADF, RTP and ML. 86 It has been proved that organic isomers can exhibit different ML behaviors in the crystal state by subtle changes in substitution positions, indicating the importance of position isomerism for the tunable photophysical properties of molecular aggregates.…”

Activating Molecular Room-Temperature Phosphorescence by Manipulating Excited-State Energy Levels in Poly(vinyl alcohol) Matrix

“…As known from early examples, , strong and abundant hydrogen bonds among chromophores and PVA matrix can significantly suppress the nonradiative decays and isolate molecular oxygen to protect the triplet excitons and realize RTP and afterglow emission. Therefore, phosphors containing hydroxyl, carboxyl, amino, or aromatic heterocycles can achieve long-lifetime RTP emission. ,, Recently, other noncovalent interactions of electrostatic and dispersion interactions were found to contribute crucially to the ultralong RTP properties. − Most studies reveal the protective effects of the PVA matrix, including restricting molecular motions, reducing vibrational dissipation, suppressing quencher diffusion, and enhancing polymer rigidity to allow the sensitive triplet excitons to emit persistently (Scheme a). However, little attention is paid to the positive effects of the PVA matrix on the intersystem crossing, which populates triplet excitons and determines the upper limit of RTP efficiency. ,, …”