Approaching an adjustable organic thermochromic luminophore library via the synergistic effects between structure-related molecular dynamics and aggregation-related luminescence

Abstract

<p>A thermochromic material library with a tunable luminescence color-switching window and temperature-responsive window was applied in ultrahigh-level optical data encryption and decryption.</p>

Achieving Organic Smart Fluorophores by Controlling the Balance between Intermolecular Interactions and External Stimuli

“…The broad absorption bands of these three compounds in a range of 350− 450 nm can be attributed to the intramolecular charge transfer of the donor−acceptor pairs, and the sharp absorption peaks in a range of 250−350 nm can be assigned to the localized excited states of the donor and acceptor moieties, which are similar to the reported compounds in the literature. 23 The above results indicated that the single molecule excited-state properties of such compounds in dilute solutions are not affected by the alkyl chain length. Based on this, for a better understanding of the optical properties of a single molecule, theoretical calculations were performed with the Gaussian 09 package at the B3LYP level based on the T4-Py crystal structure.…”

“…The almost identical fluorescence spectra and absorption spectra of T1-Py , T4-Py , and T12-Py in dilute chloroform solutions (1 × 10 –6 M) are shown in Figure a and Figure S1. The broad absorption bands of these three compounds in a range of 350–450 nm can be attributed to the intramolecular charge transfer of the donor–acceptor pairs, and the sharp absorption peaks in a range of 250–350 nm can be assigned to the localized excited states of the donor and acceptor moieties, which are similar to the reported compounds in the literature . The above results indicated that the single molecule excited-state properties of such compounds in dilute solutions are not affected by the alkyl chain length.…”

Tunable Thermofluorochromic Sensors Based on Conjugated Polymers

“…[1][2][3][4][5][6][7][8][9][10][11][12][13] Specially relevant are those whose emission can be controlled with temperature, as luminescence transition is a quite universal method to control the aggregation of the embedded fluorophores and their luminescence (e.g., by switching between monomeric and excimer emission upon dye aggregation). [59][60][61][62][63][64][65][66][67][68] Following this approach, up to now organic nonpolymeric PCMs have been successfully combined with small molecular fluorophores to yield single-color emission switching (off/on or on/off), [59,61,65] while multicolored thermal responses, with coarse color tunability, could only be accomplished by using different fluorescent molecules. [62,66,68] Although conjugated polymers are known to manifest highly medium-dependent emission properties, to our knowledge the only so far reported examples of PCM-based thermofluorochromism using a semiconductive polymer (polydiphenylacetylene) only provided a single-color on/off fluorescence modulation, and/or it required additional chemical functionalization to improve its miscibility with the surrounding PCM.…”

“…[59][60][61][62][63][64][65][66][67][68] Following this approach, up to now organic nonpolymeric PCMs have been successfully combined with small molecular fluorophores to yield single-color emission switching (off/on or on/off), [59,61,65] while multicolored thermal responses, with coarse color tunability, could only be accomplished by using different fluorescent molecules. [62,66,68] Although conjugated polymers are known to manifest highly medium-dependent emission properties, to our knowledge the only so far reported examples of PCM-based thermofluorochromism using a semiconductive polymer (polydiphenylacetylene) only provided a single-color on/off fluorescence modulation, and/or it required additional chemical functionalization to improve its miscibility with the surrounding PCM. [63,69] As a proof-of-concept to validate our approach, we have selected the commercially available and broadly used fluorescent conjugated polymer poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene (MEH-PPV, Figure 1a), as it shows three crucial characteristics required to achieve PCM-based thermofluorochromism.…”

Electric‐Tunable Photoluminescence of 2D ErOCl for High‐Security Encryption of Programmable Information

“…[4][5][6][7] Especially, luminescent materials with multi-level encryption have attracted increasing attention. [8][9][10][11] For example, Zhang et al designed thermoswitchable fluorescent materials which have multimode response modulated by the thermally induced change of phase. [8] This kind of encryption can hardly be decrypted due to its high complexity and switchable ability, which will contribute to a senior security level.…”