Luminescent properties of Eu-doped germanate apatite Sr2La8(GeO4)O2

Synthesis and VUV–UV spectroscopic properties of rare earth borosilicate oxyapatite: RE5Si2BO13:Ln3+ (RE=La, Gd, Y; Ln=Eu, Tb)

“…For Eu 3+ -doped sample, the excitation spectra is dominated by a broad CTB of Eu 3+ -O 2À within 200-350 nm, together with the host absorption band within 175-200 nm. It has been proved that in Eu 3+ -doped Sr 2 La 8 (GeO 4 ) 6 O 2 apatites, the CTS and 7 F 0 -5 D 2 excitation at 464 nm can be more effective to excite the Eu 3+ at 6h site, and the 7 F 0 -5 L 6 excitation at 394 nm is more effective to Eu 3+ at 4f sites [19]. Similar assignments can be obtained by comparing with the emission spectra under different excitations as shown in Fig.…”

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].…”

Influence of cation substitution on the crystal structure and luminescent properties in apatite structural Ba4.97−Sr (PO4)3Cl:0.03Eu2+ phosphors

“…Apatite, with a general formula of A 5 (BO 4 ) 3 C, has a hexagonal structure and belongs to the space group P6 3 /m, wherein, A is a mono-, di or tri-divalent cation such as K + , Na + , Mn 2+ , Ca 2+ , Sr 2+ , Ba 2+ or Ce 3+ , BO 4 , and C is occupied by anion F -, Cl -, Br -, O -or OH - [7], [8] and [9].…”