Constructing novel red-emitting Ba2Y0.8Eu0.2NbO6:Mn4+ phosphors for multi-type luminescent thermometers and high-security anti-counterfeiting films

To date, luminescent materials have been preferably used for non-contact optical thermometers. In this manner, novel red-emitting Ba 2 Y 0.8 Eu 0.2 NbO 6 :Mn 4+ (BYEN:Mn 4+ ) phosphors were designed for multi-type non-contact luminescent thermometers based on the dual-emission states and temperature-dependent lifetime (TDL) models. In the temperature range of 303–483 K, the sensing sensitivities based on the dual-emission states of ( 5 D 0 → 7 F 2 , 2 E g → 4 A 2g ) and ( 5 D 0 → 7 F 1 , 2 E g → 4 A 2g ) were estimated. Especially, the maximum absolute sensing sensitivity ( S a ) was found to be about 0.1558 K -1 for the BYEN:0.007Mn 4+ phosphor based on the 5 D 0 → 7 F 1 and 2 E g → 4 A 2g positions. This phosphor also exhibited good relative sensing sensitivity ( S r ) (0.0186 K -1 ) based on the 5 D 0 → 7 F 2 and 2 E g → 4 A 2g states. Besides, the relative sensing sensitivities ( S R ) at 5 D 0 → 7 F 1 and 2 E g → 4 A 2g transitions were estimated to be 0.0034 and 0.0194 K -1 , respectively with the help of the TDL technique. In the light of these results, novel red-emitting Ba 2 Y 0.8 Eu 0.2 NbO 6 :Mn 4+ phosphors are expected to be a potentially attractive candidate for applications in multi-type luminescent thermometers. Finally, a novel unique polydimethylsiloxane film exhibiting tricolor-luminescent emissions was introduced and further suggested for high-security anti-counterfeiting. • Novel temperature-sensitive Ba 2 Y 0.8 Eu 0.2 NbO 6 :Mn 4+ materials were prepared. • The luminescent behaviors and characterizations were investigated in detail. • Relative sensing sensitivity based on non-TCL dual-emission was 0.0186 K -1 . • Relative sensing sensitivity based on TDL method was 0.0194 K -1 . • Sensitivity was compared in different doping concentrations and various techniques.