Novel cyan emissive organic–inorganic copper halides: Phase transition, flexible large-area composite film, and multifunctional luminescent applications

Lingling Xie, Zheng Liu, Ning Lv, Zhe Liu, Henan Yang, Huihui Pi, Xitao Li, Siyi Li, Jiawen Xiao, Zhenguang Wang, Zhengguo Lin, Yongtian Wang, Bingkun Chen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Organic-inorganic copper halides (OICHs) are attractive due to their outstanding photophysical properties, low toxicity and high abundance. However, the absence of the high-energy emissive OICHs significantly hinders the full-spectrum white light emitting diode (WLED) for high-quality applications and the preparation of large-area films still faces challenges. Herein, we have synthesized a novel cyan emissive (C19H18P)2CuI3 by lowering the inorganic anion skeletons dimension in yellow emissive (C19H18P)2Cu4I6, and proposed an UV curing technology to fabricate large-area composite films (10*10 cm2), which is one of the largest reported films based on OICHs. The structure and luminescent properties of (C19H18P)2CuI3 could transform into that of (C19H18P)2Cu4I6 under methanol treatment. Notably, the PLQYs of (C19H18P)2CuI3 based cyan and (C19H18P)2Cu4I6 based yellow composite films are 78.2% and 96.1%, respectively. Moreover, the cyan and yellow composite films exhibit desirable endurance to air, whose PLQYs could remain 94.12% and 96.26% of its initial value stored in air for 45 days. Remote WLED with high luminous efficiency of 74.44 lm W−1 and powders based cyan-gap free WLED have been fabricated. Additionally, the (C19H18P)2CuI3 and (C19H18P)2Cu4I6 based compounds are used as luminescent pastes for encryption applications, and the two composite films are also used for X-ray detection and imaging.

Original languageEnglish
Article number178495
JournalJournal of Alloys and Compounds
Volume1012
DOIs
Publication statusPublished - 25 Jan 2025

Keywords

  • Large-area flexible films
  • Luminescent pastes
  • Organic-inorganic copper halides
  • Remote light emitting diode
  • X-ray detection and imaging

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Xie, L., Liu, Z., Lv, N., Liu, Z., Yang, H., Pi, H., Li, X., Li, S., Xiao, J., Wang, Z., Lin, Z., Wang, Y., & Chen, B. (2025). Novel cyan emissive organic–inorganic copper halides: Phase transition, flexible large-area composite film, and multifunctional luminescent applications. Journal of Alloys and Compounds, 1012, Article 178495. https://doi.org/10.1016/j.jallcom.2025.178495