Organic cation directed one-dimensional cuprous halide compounds: syntheses, crystal structures and photoluminescence properties

• Published in: Dalton transactions : an international journal of inorganic chemistry 2019-07, Vol.48 (27), p.1151-1159
• Main Authors: Yue, Cheng-Yang, Lin, Na, Gao, Lu, Jin, Ying-Xue, Liu, Zhao-Yang, Cao, Yao-Yao, Han, Sha-Sha, Lian, Xi-Kai, Hu, Bing, Lei, Xiao-Wu
• Format: Article
• Language: English
• Subjects: Cations; Crystal structure; Crystallography; Emission analysis; Halides; Metal halides; Organic light emitting diodes; Photoexcitation; Photoluminescence; Temperature dependence
• ISSN: 1477-9226; 1477-9234
• DOI: 10.1039/c9dt01460h

In recent years, organic-inorganic hybrid metal halides have emerged as a highly promising class of semiconducting light emitting diodes (LEDs) due to their fascinating photoluminescence properties. Here, by specifically selecting different organic cations as templates, a series of new hybrid cuprous halides have been solvothermally prepared, namely [Me-Py]CuI 2 ( 1 ), [(Me) 2 -DABCO]Cu 2 I 4 ( 2 ), [Me-MePy]Cu 2 I 3 ( 3 ), and [H 2 DABCO]Cu 3 X 5 (X = I ( 4 ) and Br ( 5 )). These hybrid cuprous halides feature one-dimensional (1D) [CuI 2 ] − , [Cu 2 I 3 ] − and [Cu 3 X 5 ] 2− (X = Br, I) chains surrounded and charge-balanced by organic cations. Under UV photoexcitation, these hybrid cuprous halides exhibit strong tunable photoluminescence from cyan (480 nm) to red (675 nm) emissions with large Stokes shifts (345 nm). The intrinsic nature of PL emissions is also investigated based on temperature-dependent PL emission, lifetime, photoluminescence quantum efficiencies, etc . One-dimensional organic-inorganic hybrid cuprous halides exhibit strong tunable photoluminescence from cyan to red emissions with large Stokes shifts.