Charge transfer band excited (Sr,Ba)2YTaO6:Eu3+ reddish-orange-emitting phosphors for luminescence lifetime thermometry and flexible anti-counterfeiting labels

Abstract

Strong reddish-orange-emitting (Sr,Ba)2YTaO6:Eu3+ phosphors were synthesized via a facile solid-state reaction. Due to the occupation of Y3+ ions in the high symmetry (Oh) sites as an inversion symmetry site, the 5D0 → 7F1 magnetic dipole transition peak was dominant in the (Sr,Ba)2YTaO6:Eu3+ phosphors under the charge transfer band excitation. Both Sr2YTaO6:Eu3+ (SYTO:Eu3+) and Ba2YTaO6:Eu3+ (BYTO:Eu3+) phosphors exhibited good thermal stability and quantum yield. Their luminescence sensing performances (relative sensing sensitivity) were determined to be 0.18% K−1 (BYTO:0.1Eu3+) and 0.13% K−1 (SYTO:0.1Eu3+) with the aid of the Struck and Fonger models. Furthermore, novel deep ultraviolet-excited phosphors-based polydimethylsiloxane flexible light-emitting films were fabricated for anti-counterfeiting applications. Consequently, this work reveals that the strong reddish-orange-emitting (Sr,Ba)2YTaO6:Eu3+ phosphors are suitable for dual-functional applications including luminescence lifetime thermometry and flexible anti-counterfeiting labels.