Mn²⁺ luminescence of Gd(Zn,Mg)B₅O₁₀ pentaborate under high pressure

Abstract

Results of X-ray diffraction studies of Gd(Mg0.95 x,ZnxMn 0.05)B5O10 down-converting phosphor as a function of Mg-Zn composition are presented. Lattice parameters and unit cell volumes of GdMg0.95-xZnxMn0.05B5O10 pentaborates are examined....

Effect of Temperature and High Pressure on Luminescence Properties of Mn3+ Ions in Ca3Ga2Ge3O12 Single Crystals

“…The blue shift of observed broad-band PL also provides a strong support for its assignment to the Mn 3+ dopant as a d 4 system. Indeed, should this luminescence be associated with 4 T 1 → 6 A 1 transitions of Mn 2+ , a red PL shift should have been seen, in accordance with Tanabe–Sugano diagrams for d 5 systems as well as several experimental results, as for example, shown in refs and .…”

High-Pressure Near-Infrared Luminescence Studies of Fe3+-Activated LiGaO2

“…The pressure coefficient of PL energy is equal to around −74 cm –1 /GPa. Similar behavior was also observed in the Mn 2+ -doped pentaborate sample under high pressure . As well, due to the increase in pressure, the position of the low-temperature phonon line is slightly red-shifted, from its initial position of 709 to 714 nm.…”

“…Amorphization of the nanocrystallites is reversible, although only partially since after decompression, the sample does not return to the initial crystallographic orthorhombic structure. Previously, it was observed that for Mn 2+ dopant, having the same d 5 electronic structure as Fe 3+ , in several materials (jervisite NaScSi 2 O 6 , 42 pentaborate GdZnB 5 O 10 , 41 and Tb 3 Al 5 O 12 garnet 48 ), pressure application lead to the luminescence quenching, which was associated with pressureinduced crossing between the luminescent 4 T 1g emitting level with the nonluminescent, strongly coupled to the lattice 2 T 2g level. Pressure-induced decrease in the decay time of Mn 2+ in ZnS was also observed in ZnS.…”

Eu2+ and Mn2+ co-doped Lu2Mg2Al2Si2O12 phosphors for high sensitivity and multi-mode optical pressure sensing

“…38,39 The energy levels of Mn 2+ ions can be represented by the Tanabe–Sugano diagram. 40,41 The positions of the energy levels are determined by the Racah parameters B and C and the crystal field splitting degree ( D q ), 18,34 which can be specifically calculated from the energy levels of the excitation spectra in Fig. S6† and the following equations: 40 6A 1 ( 6 S) → 4 E( 4 D) = 17 B + 5 C 6A 1 ( 6 S) → 4 A 1 , 4 E( 4 G) = 10 B + 5 C 6A 1 ( 6 S) → 4 T 2 ( 4 G) = −10 D q + 18 B + 6 C − (38 B 2 /10 D q )…”

“…17 By introducing the above ions, researchers have designed a variety of new types of optical pressure sensing phosphors, such as BaLi 2 Al 2 Si 2 N 6 :Eu 2+ , Gd(Zn,Mg)B 5 O 10 :Mn 2+ , Y 6 Ba 4 (SiO 4 ) 6 F 2 :Ce 3+ and Ca 2 Gd 8 Si 6 O 26 :Ce 3+ . 8,[18][19][20] These optical pressure sensing phosphors, although have high sensi-tivities, are very prone to errors when calibrating pressure through movement in the central peak position alone. Thus, designing high-sensitivity, multi-mode optical pressure sensing phosphors still involves challenges.…”