Optical spectroscopy of Ca3Sc2Si3O12, Ca3Y2Si3O12 and Ca3Lu2Si3O12 doped with Pr3+

Abstract

a b s t r a c tThe silicates Ca 3 Sc 2 Si 3 O 12 , Ca 3 Y 2 Si 3 O 12 and Ca 3 Lu 2 Si 3 O 12 , both undoped and doped with Pr 3 + ions, have been synthesized by solid-state reaction at high temperature. The luminescence spectroscopy and the excited state dynamics of the materials have been studied upon VUV and X-ray excitation using synchrotron radiation. All doped samples have shown efficient 5d-4f emission upon direct VUV excitation of 5d levels, but only Ca 3 Sc 2 Si 3 O 12 :Pr 3 + shows luminescence upon interband VUV or X-ray excitation. The VUV excited emission spectra of Ca 3 Y 2 Si 3 O 12 :Pr 3 + and Ca 3 Lu 2 Si 3 O 12 :Pr 3 + show features attributed to emission from two distinct sites accommodating the Pr 3 + dopant. The decay kinetics of the Pr 3 + 5d-4f emission in Ca 3 Sc 2 Si 3 O 12 :Pr 3 + upon VUV excitation across the band gap are characterized by decay times in the range 25-28 ns with no significant rise after the excitation pulse. They appear to be faster upon X-ray irradiation than for VUV excitation. Weak afterglow components are attributed to defect luminescence.

Luminescence of Ce3+ at two different sites in α-Sr2P2O7 under vacuum ultraviolet-UV and x-ray excitation

“…In particular, for application in new time-offlight PET scanners, novel lanthanide-doped scintillation materials with faster luminescence are required. 7 The alpha-phase of strontium pyrophosphate ␣-Sr 2 P 2 O 7 is an important host for luminescence of lanthanides and transition metals. [8][9][10] In this paper, the luminescence properties of Ce 3+ doped ␣-Sr 2 P 2 O 7 is investigated.…”

Новый люминофор ИК-диапазона на основе германата Sr-=SUB=-3-=/SUB=-La-=SUB=-2-=/SUB=-(Ge-=SUB=-3-=/SUB=-O-=SUB=-9-=/SUB=-)-=SUB=-2-=/SUB=- : Nd-=SUP=-3+-=/SUP=-, Ho-=SUP=-3+-=/SUP=-

“…Силикаты и германаты редкоземельных элементов (РЗЭ) представляют интерес в качестве эмиссион-ных сред видимого, ближнего и среднего ИК-диапа-зонов [1][2][3][4][5][6][7][8][9][10]. Особое место среди этих материалов занимают иттрийсодержащие силикаты кальция и строн-ция A 3 Y 2 (Si 3 O 9 ) 2 (A = Ca, Sr) [11][12][13][14][15][16][17].…”

VUV–UV 5d–4f interconfigurational transitions of Nd3+ in BaMgF4 ferroelectric crystals

“…In this context, the use of this BMF ferroelectric crystal as a host matrix for optically active ions appears as a very interesting subject [4][5][6]. In the last years there has been an increasing interest in the study of the parity-allowed 5d-4f transitions of various trivalent rare earth ions (RE 3 þ ) incorporated in wide band-gap host lattices for potential applications in the field of scintillators, UV and VUV phosphors and lasers [7][8][9]. The VUV-UV broad band emission resulting from the interconfigurational 5d-4f transitions of appropriately chosen RE 3 þ ions, combined with the use of the compact pumping sources, may provide the possibility to realize coherent and tunable VUV-UV radiation sources.…”