Kilogram‐Scale Fabricated Organic Long‐Persistent Luminescence Materials with Multi‐Level Temperature Response

Abstract

When it comes to the key issues of fabrication of such materials, amorphous materials rely on harsh process conditions such as melting-quenching or polymer doping, [3] while crystalline materials mainly rely on natural crystallization in organic solvents with unmanageable crystal sizes and not good reproducibility. [1b,e,4] However, the characteristics of these reported preparation processes cause the final product to be generally in the milligram-or gramlevel, implying that the development of efficient large-scale fabrication methods will facilitate the commercial application of OLPLMs. Therefore, developing a fast, convenient, and "green" method for large-scale fabrication of OLPLMs will effectively accelerate the application development and commercialization of such materials.Generally, the rigid crystal matrix of organic crystalline materials can stabilize triplet excitons and suppress non-radiative decay, thereby improving persistent room-temperature phosphorescence (RTP) performance, that is an important strategy to enable long-persistent luminescence (LPL) performance of OLPLMs. [1c,5] Among them, host-guest doping crystals have attracted much attention, as doping of a phosphor guest into small molecular host matrices could generate the outstanding persistent-RTP effect without being easily quenched in an Purely organic long-persistent luminescence materials (OLPLMs) have shown great application potential in the fields of anti-counterfeiting and information encryption, due to their eco-friendly preparation, low synthesis cost, and easy-to-tune luminescence. Notably, the development of efficient large-scale fabrication methods will facilitate the commercial application of OLPLMs. Here, we realized the kilogram-scale preparation of organic doped-crystals with different long-persistent luminescence durations by a facile water-based method under ambient conditions. Additionally, the function of reversible multi-level temperature response of LPL performance based on this kind of OLPLMs has been achieved, showing the unique application prospects in the field of anti-counterfeiting and information encryption. This work provides an effective strategy for large-scale fabrication of OLPLMs, and will accelerate the research and development of temperature-responsive OLPLMs.

DFT and TDDFT Studies of Silicon Analogs of Fluorescein Derivatives

“…Finally, we point out that the predicted molecules are worthy of experimental synthesis and characterizations. While common synthetic methods can be utilized, 1,[118][119][120][121][122] large scale synthesis 123 including heterogeneous catalysis [124][125][126][127][128][129][130][131][132][133][134] and automated synthesis 135 may also be necessary in exploring the synthesis of organic small molecule materials 136 that have great potential applications.…”

A General Strategy for Developing Ultrasensitive “Transistor‐Like” Thermochromic Fluorescent Materials for Multilevel Information Encryption

“…[5,6,12,13] According to the difference in their thermal-response mechanism, these TFMs can be grouped into two categories. One type of TFMs is constructed by using an emitter (nano-luminophores like lanthanide nanoparticles [14] and carbon dots, [15] molecular luminophores like transition metal complexes, [16] and organic dyes [17][18][19] ) with the intrinsically thermally responsive property. Though such TFMs exhibit an extremely wide response range of temperature (from 77 to 573 K), the relative temperature sensitivity of their luminescence is extremely low (S r < 5.27% K −1 ).…”

Tuning the HOMO Energy of the Triarylamine Molecules with Orthogonal HOMO and LUMO Using Functional Groups

“…[41][42][43][44][45][46][47][48][49] Recently we have reported a series synthetic and theoretical studies based on the triphenylamine structure (TPA). [50][51][52][53][54][55][56][57][58][59][60][61][62] Five styryl triphenylamines or indoline derivatives have been synthesized, and the UV-vis spectrum of the styryl indoline derivative showed obvious red shift of 20 nm than the styryl triphenylamine, indicating a better electron-donating ability of the indoline ring. 63 In addition, a new type of DSSC dye with a donor-acceptor1-acceptor2 architecture using a styryl triphenylamine moiety as the donor and a triazine and an anthraquinone molecules as serial acceptors was designed and synthesized by our group, and a sequential electron transfers together with effective hole transfer and a charge separated state with lifetime of 650 ns in this D-A1-A2 dye were observed.…”