A convenient preparation of nano-powders of Y2O3, Y3Al5O12 and Nd:Y3Al5O12 and study of the photoluminescent emission properties of the neodymium doped oxide

作者：Dell'Amico Daniela Belli; Biagini Paolo; Bongiovanni Giovanni; Chiaberge Stefano; Di Giacomo Alessio; Labella Luca^*; Marchetti Fabio; Marra Gianluigi; Mura Andrea; Quochi Francesco; Samaritani Simona; Sarritzu Valerio

来源：Inorganica Chimica Acta, 2018, 470: 149-157.

DOI：10.1016/j.ica.2017.05.012

• Metal carbamato complexes
• Lanthanides
• Yttria
• YAG
• Nd:YAG
• Luminescence

[Y(O2CNBu2)(3)], has been prepared by extraction of the Y3+ ions from aqueous solution into heptane by the NHBu2/CO2 system. Exhaustive hydrolysis of [Y(O2CNBu2)(3)] produced the yttrium carbonate [Y-2(CO3)(3).n H2O] (n = 2-3), that was converted to Y2O3 by thermal treatment at 550 degrees C for 12 h. The exhaustive hydrolysis of [Y(O2CNBu2)(3)] and [Al(OBu)(3)] (Y/Al molar ratio = 3/5) carried out at room temperature yielded an intermediate mixed carbonate, that, upon heating at 950 degrees C for 12 h, was converted to Y3Al5O12. The exhaustive hydrolysis of [Y(O2CNBu2)(3)] and [Al(OBu)(3)] was repeated in the presence of [Nd(O2CNBu2)(3)] (Nd/Y molar ratio = 0.07;(Nd + Y)/Al molar ratio = 3:5). The neodymium doped garnet Nd:Y3Al5O12 was obtained, through the intermediate formation of a mixed hydroxo-carbonate. For comparison, the neodymium doped garnet was prepared also starting from N, N-dialkylcarbamato complexes of all three metals, [Y(O2CNBu2)(3)], [Nd(O2CNBu2)(3)] and [Al-2(O2CNiPr2)(6)] (Nd/Y molar ratio = 0.07;(Nd + Y)/Al molar ratio = 3: 5). Also in this case the intermediate mixed hydroxo-carbonate, after heating at 950 degrees C for 12 h, evolved to Nd:Y3Al5O12.
FTIR, XRD, SEM, TGA measurements were used for the characterization of the obtained materials. Preliminary studies of the photoluminescent emission properties were carried out on Nd:Y3Al5O12. Photoluminescence dynamics have been investigated by means of femtosecond laser pulses and nanosecond temporal resolution up to the millisecond range after excitation. All the luminescence traces have shown a decay time of the order 200 microseconds indicating its potential as a laser medium for infrared emission at 1064 nm.

• 出版日期2018-1-30