High-Tp-triggered phase transition exhibiting switchable dielectric–thermal responses and long photoluminescence lifetime in a novel inclusion luminophor

Materials combining high-temperature phase transformation and fluorescence properties are not abundant, especially, stator–rotator-type inclusion compounds possessing excellent optical properties are extremely rare. In this study, a neoteric high-temperature crown ether inclusion luminophor: [(2,4,6...

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Bibliographic Details
Published inCrystEngComm Vol. 24; no. 19; pp. 3630 - 3636
Main Authors Ding-Chong, Han, Yu-Hui, Tan, Jia-Hui, Wen, Yun-Zhi Tang, Peng-Fei, Wu, Yu-Kong, Li, Ming-Yang, Wan, Xiao-Wei, Fan
Format Journal Article
LanguageEnglish
Published Cambridge Royal Society of Chemistry 01.01.2022
Subjects
Crown ethers
Dielectrics
Differential thermal analysis
Emission analysis
Energy bands
High temperature
Luminescence
Optical properties
Phase transitions
Photoluminescence
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Summary:Materials combining high-temperature phase transformation and fluorescence properties are not abundant, especially, stator–rotator-type inclusion compounds possessing excellent optical properties are extremely rare. In this study, a neoteric high-temperature crown ether inclusion luminophor: [(2,4,6-trifluoroanilinium)-(18-crown-6)][BF4] (1) was constructed, undergoing a reversible phase transition near Tp = 364 K. Differential thermal analysis (DTA), specific heat capacity (Cp) and differential scanning calorimetry (DSC) tests disclosed a reversible first-order phase transformation behavior of 1. Multiple-temperature PXRD analyses further demonstrated a structural transition from low- to high-symmetry. Permittivity tests for 1 exhibited a prominent step-like dielectric response near Tp, indicating that it is a promising dielectric switching material. Besides, 1 occupies a broad optical energy band of ca. 4.45 eV. The photoluminescence tests for 1 display a strong luminescence emission peak at 368 nm. Further research and computational analysis showed that the luminescence lifetime of 1 reaches up to 43.998 μs. The investigation opens up an alternative avenue to construct and synthesize phase-transition compounds possessing high-Tp and superior optical properties.
ISSN:1466-8033
DOI:10.1039/d2ce00236a