Influence of rare-earth doping on the photoluminescence of Zinc Oxide nanophosphors
نویسنده
چکیده
This paper reports the photoluminescence studies of Eu (RE)-doped ZnO nanophosphors synthesized by precipitation method using ethanolic solution as solvent. The prepared samples are characterized by a Philips Holland TW 1710 XRD measuring instrument with Co target. The ZnO structure is found to be wurtzite. The particle sizes are found to be in the range of 70 nm to 90 nm. The prominent peaks for EU doped ZnO for different concentrations of Eu are (100), (002), (101), (102), (110). The XRD results revealed that the presence of dopants has not altered the basic structure of the compound. The PL studies of Eu doped ZnO were carried out by FL 2500 Flourescence spectrophotometer in the wavelength range 350 nm to 700 nm. The emission spectra Eu:ZnO for the different concentration of Eu exhibited peaks near 620 nm at 594 nm with the intensity variation proportional to different doping concentrations . The broad emission spectrum around 550 nm observed in case of undoped (zero wt% Eu doped) ZnO is generally known to result from the superposition of green and red emission due to selfactivated centers. However the emission spectra for Eu doped ZnO calcined at 200 C shows peaks at 620 nm suggesting a possible red emission which arises due to D0 → F2 transition of Eu ion.
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