Luminescence of Ce³⁺traces in Pr³⁺-doped LuBO₃₊and YBO₃₊orthoborates

Abstract

The luminescence of three orthoborates: LuBO 3 with calcite and vaterite structures and vaterite YBO 3 doped with Pr 3+ ions has been investigated. The intense broad bands observed in the emission and excitation spectra were attributed to Pr 3 4f5d↔4f 2 transitions. The emission was ascribed to four spinallowed transitions and one spin-forbidden from the lowest 4f5d level to 4f 2 configuration multiplets. Two additional broad emission bands with very weak intensity at 440 and 580 nm were studied. Evidence of the presence of Ce 3+ traces is reported and their influence on Pr 3+ luminescence is discussed.

Conceptual Ultraviolet‐C Light Source Based on Up‐Conversion Luminescence

“…Conventional photoluminescence performance of YBO 3 :Pr 3þ phosphor has been well studied under excitation with X-ray beam or vacuum ultraviolet light. [31] As expected, in our experiment, upon X-ray excitation, the phosphor film exhibits characterized emissions of Pr 3þ , peaking at ultraviolet and visible spectral regions (Figure S1, Supporting Information). Moreover, according to the energy-level structure of Pr 3þ in YBO 3 , up-conversion luminescence process of the phosphor upon blue light excitation is predictable, although the related report is absent in the literature.…”

Growth and luminescence characteristics of Pr3+-doped Lu0.8Sc0.2BO3 single crystal

“…Hence, we tentatively speculate that the cause of the above phenomenon results from the different energy distribution of the 5d and the 3PJ levels of Pr3+ for different excitation source. The 5d 1 4f 1 → 4f 2 emission bands in the region from 250 to 325 nm can be well resolved into four Gaussian components peaking at 256, 267, 290 and 309 nm, which are well agreement with the 5d 1 4f 1 → 4f 2 emission bands of Pr 3+ in calcite phase LuBO 3 host [25]. Based on the integral intensity calculated for XEL spectrum over 250-350 nm (4f 1 5d 1 → 4f 2 emission bands of Pr 3+ ), it is estimated that the scintillation efficiency of Lu 0.8 Sc 0.2 BO 3 :0.5 at%Pr 3+ crystal corresponds to about 170% of the BGO standard scintillator (8500 ph/MeV), less than the value of LPS:Pr 3+ (five times of BGO scintillator) [28].…”

“…In Fig. 4(a), the photoluminescence emission spectrum presents two types of emission bands: 4f → 4f emission bands between 500 and 710 nm corresponding to 3 P J → 3 H J transitions [24] and 5d 1 4f 1 → 4f 2 emission bands between 250 and 350 nm corresponding to the lowest crystal field component of the 4f 1 5d 1 excited state to the 4f 2 ground states: 3 H 4 , 3 H 5 , ( 3 H 6 , 3 F 2 ) and ( 3 F 3,4 ) levels (although could not be well resolved) [25]. The excitation bands at 218 nm and 234 nm (see Fig.…”

Ambient light stimulation enabling intense and long-lasting ultraviolet-C persistent luminescence from Pr3+-doped YBO3 in bright environments

“…2b. When excited with 249 nm UV light, the YBO 3 :Pr 3+ phosphor exhibits four intense emission bands over 250–330 nm, 38,40 numbered from 1 to 4, as shown in Fig. 2b.…”

“…, BaY 4 Si 5 O 17 :Pr 3+ and Lu 2 SiO 5 :Pr 3+ ), etc. 38–45 To take it forward, a few Pr 3+ -doped UVC persistent phosphors have also been reported recently. 29–33,46,47 For example, Yang et al 30 reported Cs 2 NaYF 6 :Pr 3+ UVC persistent phosphor with a persistence time of ∼2 h in a dark environment after X-ray irradiation.…”