Eu³⁺ Single-Doped Phosphor with Antithermal Quenching Behavior and Multicolor-Tunable Properties for Luminescence Thermometry

Abstract

To date, non-contact luminescence thermometry methods based on fluorescence intensity ratio (FIR) technology have been studied extensively. However, designing phosphors with high relative sensitivity (S r) has become a research hotspot. In this work, Eu3+ single-doped Ca2Sb2O7:Eu3+ phosphors with a high S r value for dual-emitting-center luminescence thermometry are developed and proposed. The anti-thermal quenching behavior of Eu3+ originating from the energy transfer (ET) of host → Eu3+ is found and proved in the designed phosphors. Interestingly, adjustable color emission from blue to orange can be achieved. Surprisingly, the degree of the anti-thermal quenching behavior of Eu3+ gradually reduces from 240 to 127% as the Eu3+ doping content increases from 0.005 to 0.05 mol, attributed to most Eu3+ being located in the low symmetrical [Ca1O8] dodecahedral site. According to the differentiable responses of the host and Eu3+ to temperature, the maximal S r value reaches 3.369% K–1 (383 K). Moreover, the ambient temperature can be intuitively predicted by observing the emitting color. Owing to the excellent performance in optical thermometry, color-tunable properties, and outstanding acid and alkali resistance for polydimethylsiloxane (PDMS) films, the developed Eu3+ single-doped Ca2Sb2O7:Eu3+ phosphors are expected to be prospective candidates in luminescence thermometers and LED devices in various conditions.

Cationic composition engineering in double perovskite XLaLiTeO6:Eu3+(X = Ba, Sr, Ca, and Mg) toward efficient and thermally stable red luminescence for domestic white-LEDs

“…1(e), the A-site centered cages formed by the nearest [LiO 6 ] and [TeO 6 ] octahedra can reduce the interaction of adjacent Eu 3+ ions at A sites, thus delaying the quenching point to a higher Eu 3+ doping content of 30 mol% compared with many reported Eu 3+ doped phosphors. 20,41,42 Fig. 2 (a) SEM images of phosphor particles, element mappings.…”

“…On the other hand, the luminescent efficiency and thermal stability of Eu 3+ doped phosphors are two important parameters for practical applications, and they mainly depend on the selection of host lattices. 20 Until now, it is still challenging to develop a general model to discuss the relationship between the luminescent properties of Eu 3+ and the crystal structure of hosts. Based on the above prospects, the double perovskite oxides come into view due to their interesting structural features.…”

Novel Red‐Emitting Gd3BW1‐xMoxO9 : Eu3+ Phosphor with High Thermal Stability for Application in UV‐Excited WLEDs and Rapid Visualization of Latent Fingerprints

“…[49] It is well-known that Eu 3 + is sensitive to the local chemical environment according to the Judd-Ofelt theory. [50][51][52] When Eu 3 + ion is located at an inversion symmetry site, the 5 D 0 ! 7 F 1 magnetic dipole transition is dominant, while in a site without an inversion center, the 5 D 0 !…”

Tunable luminescence in Eu3+/Sm3+ single-doped LuNbO4 for optical thermometry and anti-counterfeiting

“…[7][8][9] In dual-doped fluorescence thermometers based on FIR techniques, the energy gap of coupled energy levels (TCL) is too narrow (200-2000 cm À1 ), which will lead to the overlap of the emission spectrum of two TCL levels and then affect the temperature measurement performance. 10,11 Therefore, developing RE ion single-doped multicolor materials for anti-counterfeiting and temperature sensors is necessary. 12 When some RE ions are introduced into self-activated phosphors, the energy from the host can be effectively transferred to the activators under certain excitation, resulting in a tunable multicolor emission.…”