Synthesis and Upconversion Luminescence of Nanoparticles Y2O3 and Gd2O3 Co-doped with Yb3+ and Er3+
Upconversion nanoparticles (UCNs) find application in nanomedicine as biolabels to identify cancer cells. In this work, Y2O3: Er3+/ Yb3+ and Gd2O3: Er3+/ Yb3+ systems were fabricated by combustion synthesis (CS) and sol-gel (SG) methods to obtain nanoparticles with different shapes and sizes after p...
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2016-02-01
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| Series: | Nanomaterials and Nanotechnology |
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| Online Access: | http://www.intechopen.com/journals/nanomaterials_and_nanotechnology/synthesis-and-upconversion-luminescence-of-nanoparticles-y2o3-and-gd2o3-co-doped-with-yb3-and-er3 |
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| author | Dalia H. Chávez Oscar E. Contreras Gustavo A. Hirata |
| author_facet | Dalia H. Chávez Oscar E. Contreras Gustavo A. Hirata |
| author_sort | Dalia H. Chávez |
| collection | DOAJ |
| description | Upconversion nanoparticles (UCNs) find application in nanomedicine as biolabels to identify cancer cells. In this work, Y2O3: Er3+/ Yb3+ and Gd2O3: Er3+/ Yb3+ systems were fabricated by combustion synthesis (CS) and sol-gel (SG) methods to obtain nanoparticles with different shapes and sizes after post-annealing treatments. The crystallinity and morphology were analysed by x-ray diffraction (XRD) and transmission electron microscopy (TEM), respectively, and the luminescent properties by spectrofluorescence meas‐ urements. The luminescence varied depending on the doping level. In this study, for the host Y2O3, with Er3+/ Yb3+ (1%/1% mol), the green emission was more strongly attributed to the 2H 11/2→4I 15/2,4S3/2→4I 15/2 transitions of Er3+ ions. Red emission was present in Yb3+ (5%/10% mol) due to the 4F9/2→4I15/2 transition for both hosts. For the host Gd2O3, green emission was present in Er3+ (2% mol) and Yb3+ (3% mol). The surface of some UCNs was coated with a thin silica layer and analysed in order to compare the luminescence with the uncoated UCNs. The purpose of the coating was to prepare the samples for further functional‐ ization for biolabel use. Results show that the emission intensity of all samples strongly depends on the synthesis method. SG was more reliable than CS synthesis in pro‐
ducing UCNs with better morphology and luminescent properties. |
| format | Article |
| id | doaj-art-e8e78f6e6a864d819a279f6815e2560c |
| institution | Kabale University |
| issn | 1847-9804 |
| language | English |
| publishDate | 2016-02-01 |
| publisher | Wiley |
| record_format | Article |
| series | Nanomaterials and Nanotechnology |
| spelling | doaj-art-e8e78f6e6a864d819a279f6815e2560c2025-08-20T03:24:38ZengWileyNanomaterials and Nanotechnology1847-98042016-02-0167http://dx.doi.org/10.5772/6218849868Synthesis and Upconversion Luminescence of Nanoparticles Y2O3 and Gd2O3 Co-doped with Yb3+ and Er3+Dalia H. ChávezOscar E. ContrerasGustavo A. HirataUpconversion nanoparticles (UCNs) find application in nanomedicine as biolabels to identify cancer cells. In this work, Y2O3: Er3+/ Yb3+ and Gd2O3: Er3+/ Yb3+ systems were fabricated by combustion synthesis (CS) and sol-gel (SG) methods to obtain nanoparticles with different shapes and sizes after post-annealing treatments. The crystallinity and morphology were analysed by x-ray diffraction (XRD) and transmission electron microscopy (TEM), respectively, and the luminescent properties by spectrofluorescence meas‐ urements. The luminescence varied depending on the doping level. In this study, for the host Y2O3, with Er3+/ Yb3+ (1%/1% mol), the green emission was more strongly attributed to the 2H 11/2→4I 15/2,4S3/2→4I 15/2 transitions of Er3+ ions. Red emission was present in Yb3+ (5%/10% mol) due to the 4F9/2→4I15/2 transition for both hosts. For the host Gd2O3, green emission was present in Er3+ (2% mol) and Yb3+ (3% mol). The surface of some UCNs was coated with a thin silica layer and analysed in order to compare the luminescence with the uncoated UCNs. The purpose of the coating was to prepare the samples for further functional‐ ization for biolabel use. Results show that the emission intensity of all samples strongly depends on the synthesis method. SG was more reliable than CS synthesis in pro‐ ducing UCNs with better morphology and luminescent properties.http://www.intechopen.com/journals/nanomaterials_and_nanotechnology/synthesis-and-upconversion-luminescence-of-nanoparticles-y2o3-and-gd2o3-co-doped-with-yb3-and-er3Upconversion LuminescenceNanoparticlesSol-gelCombustion Synthesis |
| spellingShingle | Dalia H. Chávez Oscar E. Contreras Gustavo A. Hirata Synthesis and Upconversion Luminescence of Nanoparticles Y2O3 and Gd2O3 Co-doped with Yb3+ and Er3+ Nanomaterials and Nanotechnology Upconversion Luminescence Nanoparticles Sol-gel Combustion Synthesis |
| title | Synthesis and Upconversion Luminescence of Nanoparticles Y2O3 and Gd2O3 Co-doped with Yb3+ and Er3+ |
| title_full | Synthesis and Upconversion Luminescence of Nanoparticles Y2O3 and Gd2O3 Co-doped with Yb3+ and Er3+ |
| title_fullStr | Synthesis and Upconversion Luminescence of Nanoparticles Y2O3 and Gd2O3 Co-doped with Yb3+ and Er3+ |
| title_full_unstemmed | Synthesis and Upconversion Luminescence of Nanoparticles Y2O3 and Gd2O3 Co-doped with Yb3+ and Er3+ |
| title_short | Synthesis and Upconversion Luminescence of Nanoparticles Y2O3 and Gd2O3 Co-doped with Yb3+ and Er3+ |
| title_sort | synthesis and upconversion luminescence of nanoparticles y2o3 and gd2o3 co doped with yb3 and er3 |
| topic | Upconversion Luminescence Nanoparticles Sol-gel Combustion Synthesis |
| url | http://www.intechopen.com/journals/nanomaterials_and_nanotechnology/synthesis-and-upconversion-luminescence-of-nanoparticles-y2o3-and-gd2o3-co-doped-with-yb3-and-er3 |
| work_keys_str_mv | AT daliahchavez synthesisandupconversionluminescenceofnanoparticlesy2o3andgd2o3codopedwithyb3ander3 AT oscarecontreras synthesisandupconversionluminescenceofnanoparticlesy2o3andgd2o3codopedwithyb3ander3 AT gustavoahirata synthesisandupconversionluminescenceofnanoparticlesy2o3andgd2o3codopedwithyb3ander3 |