[Preparation of nanocrystal Gd2O3: Eu by EDTA complexing sol-gel process and spectroscopic study].
Gd2O3: Eu nanocrystal was synthesized by EDTA complexing sol-gel process at relatively low temperature, in which ethylene-diamine-tetraacetic acid (EDTA) and polyethylene glycol (PEG) were used as the chelating agent and disperser respectively. The properties of the nanocrystal were investigated by XRD, SEM, EDS, and fluorescence spectrophotometer. The results show that nanosized, homogenous and pure cubic phase Gd2O3: Eu has been produced after the precursor calcined at 800 degrees C for 2 h. The particles of the Gd2O3: Eu are basically spherical in shape and about 30 nm in size. The main emission peak of Gd2O3: Eu nanocrystal is at 611 nm, resulting in a red emission. Compared with micron scale Gd2O3: Eu phosphors prepared by a conventional method, a clear red shift occurs in the excitation spectrum of Gd2O3: Eu nanocrystal prepared by the present work, and the quenching concentration of Eu has been raised. For this type of nanophosphor, quenching starts at an Eu concentration of 8% (mol%), while a value of 6% was obtained for the conventional one.
Zhai
Yong-qing
YQ
College of Chemistry and Environmental Science, Hebei University, Baoding 071000, China.
Yao
Zi-hua
ZH
Qiu
Man-de
MD
Liu
Bao-sheng
BS
Wang
Kai-xiao
KX
Wang
Ying-jin
YJ
D002614:Chelating Agents / Q000138:chemical synthesis / Q000737:chemistry*; D003460:Crystallization; D004492:Edetic Acid / Q000737:chemistry; D005063:Europium / Q000737:chemistry*; D005682:Gadolinium / Q000737:chemistry*; D036103:Nanotechnology; D010316:Particle Size; D044367:Phase Transition; D011092:Polyethylene Glycols; D013050:Spectrometry, Fluorescence; D013696:Temperature
D002614:Chelating Agents; D011092:Polyethylene Glycols; D005063:Europium; C030581:gadolinium oxide; D004492:Edetic Acid; D005682:Gadolinium