Broadband near-infrared luminescence from Fe³⁺-activated NaScSi₂O₆ phosphors for luminescence thermometry and night-vision applications

Abstract

Broadband near-infrared (NIR) materials have recently evoked considerable interest for versatile applications, but the choices of efficient emitters for NIR phosphors are rather limited. Herein, Fe3+-activated NaScSi2O6 phosphor has been...

Broadband-excited and green-red tunable emission in Eu2+-sensitized Ca8MnTb(PO4)7 phosphors induced by structural-confined cascade energy transfer

“…The energy transfer mechanism was categorized into two types, namely, exchange interaction or multipolar interaction, which depends on the critical distance ( R c ) value. To probe Eu 2+ → Tb 3+ energy transfer mechanism, the value of R c is calculated using the Blasse formula shown in equation 16 where V represents the volume of the unit cell, N is the number of cation sites in the unit cell, and x c is the critical concentration of the doping ions. In the present condition, V = 3461.42 Å 3 , N = 8 × 6 = 48, and x c = 0.185, then the obtained value of R c = 9.06 Å, which is higher than that for the exchange interaction ( R c < 5 Å).…”

Structural confinement toward suppressing concentration and thermal quenching for improving near-infrared luminescence of Fe3+

“…S3, † the emission intensity of 50% and 100% Fe 3+ -doped samples can be maintained at 73.46% and 18.25% that of the 20% Fe 3+ -doped phosphor, respectively. In general, the optimal Fe 3+ -dopant concentration in previously reported phosphors is relatively small, such as 0.3%, 1% and 2% in ZnGa 2 O 4 , LiAl 5 O 8 and NaScSi 2 O 6 , 16,18,28 respectively. The suppressed luminescence concentration quenching in Fe 3+ -doped SGP phosphors is closely related to the unique structural characteristic of SGP.…”

A broadband near-infrared Cr3+-doped phosphor applied to near-infrared light-emitting diodes: enhanced luminescence and thermal stability by annealing

“…Cr 3+ , Mn 2+ , Fe 3+ and Eu 2+ , have been reported. [6][7][8][9][10][11][12] Notably, Cr 3+ -activated NIR phosphors have attracted more and more attention due to their strong absorption in the blue and red region, which matches well with the commercial blue LED chip, and tunable emission controlled by the crystal field strategy, which generally exhibits broadband emission in weak crystal fields (D q /B < 2.3). As an excellent NIR emitter, the Cr 3+ ion located in an octahedron field exhibits inviting optical characteristics.…”