Synthesis, characterization and up-conversion photoluminescence properties of Y2O3: Er3+, Yb3+ nano-phosphors for solar cell applications
Photovoltaic solar cells can generate electricity directly from sunlight without emitting greenhouse gases. This makes it an ideal candidate as a large scale energy producer. However, the sub-bandgap loss problem of solar cells limits its efficiencies. Up-conversion mechanism could minimize this sub...
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| Format: | Final Year Project (FYP) |
| Language: | English |
| Published: |
2010
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| Online Access: | http://hdl.handle.net/10356/42434 |
| _version_ | 1811684091683143680 |
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| author | Goh, Lee Ser. |
| author2 | Alfred Tok Iing Yoong |
| author_facet | Alfred Tok Iing Yoong Goh, Lee Ser. |
| author_sort | Goh, Lee Ser. |
| collection | NTU |
| description | Photovoltaic solar cells can generate electricity directly from sunlight without emitting greenhouse gases. This makes it an ideal candidate as a large scale energy producer. However, the sub-bandgap loss problem of solar cells limits its efficiencies. Up-conversion mechanism could minimize this sub-bandgap loss. Thus a high efficient up-conversion material is necessary. The project aims to synthesize phosphor in nano sizes with in depth study on the factors that influence the crystal growth process and the up-conversion photoluminescence (PL).
The Y2O3: Er3+, Yb3+ phosphors were synthesized via hydrothermal / solvothermal method with varied surfactant (oleic acid) concentration, followed by calcinations to change its crystal structure from hexagonal to cubic bixbyite. FESEM, TEM, XRD and PL spectra were used to characterize these products. Three products with different size (40nm – 2um) and shape were obtained, namely, nanoparticle, nanobelt, and microrod. These differences were largely controlled by the concentration of surfactant and different surface energy of nuclei facets. The higher surface energy facets would growth faster than the others, but the growth could be inhibited by surfactants which prefer to bind to higher surface energy facets. |
| first_indexed | 2024-10-01T04:23:07Z |
| format | Final Year Project (FYP) |
| id | ntu-10356/42434 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T04:23:07Z |
| publishDate | 2010 |
| record_format | dspace |
| spelling | ntu-10356/424342023-03-04T15:42:24Z Synthesis, characterization and up-conversion photoluminescence properties of Y2O3: Er3+, Yb3+ nano-phosphors for solar cell applications Goh, Lee Ser. Alfred Tok Iing Yoong School of Materials Science and Engineering DRNTU::Engineering::Materials Photovoltaic solar cells can generate electricity directly from sunlight without emitting greenhouse gases. This makes it an ideal candidate as a large scale energy producer. However, the sub-bandgap loss problem of solar cells limits its efficiencies. Up-conversion mechanism could minimize this sub-bandgap loss. Thus a high efficient up-conversion material is necessary. The project aims to synthesize phosphor in nano sizes with in depth study on the factors that influence the crystal growth process and the up-conversion photoluminescence (PL). The Y2O3: Er3+, Yb3+ phosphors were synthesized via hydrothermal / solvothermal method with varied surfactant (oleic acid) concentration, followed by calcinations to change its crystal structure from hexagonal to cubic bixbyite. FESEM, TEM, XRD and PL spectra were used to characterize these products. Three products with different size (40nm – 2um) and shape were obtained, namely, nanoparticle, nanobelt, and microrod. These differences were largely controlled by the concentration of surfactant and different surface energy of nuclei facets. The higher surface energy facets would growth faster than the others, but the growth could be inhibited by surfactants which prefer to bind to higher surface energy facets. Bachelor of Engineering (Materials Engineering) 2010-12-02T06:03:13Z 2010-12-02T06:03:13Z 2010 2010 Final Year Project (FYP) http://hdl.handle.net/10356/42434 en Nanyang Technological University 50 p. application/pdf |
| spellingShingle | DRNTU::Engineering::Materials Goh, Lee Ser. Synthesis, characterization and up-conversion photoluminescence properties of Y2O3: Er3+, Yb3+ nano-phosphors for solar cell applications |
| title | Synthesis, characterization and up-conversion photoluminescence properties of Y2O3: Er3+, Yb3+ nano-phosphors for solar cell applications |
| title_full | Synthesis, characterization and up-conversion photoluminescence properties of Y2O3: Er3+, Yb3+ nano-phosphors for solar cell applications |
| title_fullStr | Synthesis, characterization and up-conversion photoluminescence properties of Y2O3: Er3+, Yb3+ nano-phosphors for solar cell applications |
| title_full_unstemmed | Synthesis, characterization and up-conversion photoluminescence properties of Y2O3: Er3+, Yb3+ nano-phosphors for solar cell applications |
| title_short | Synthesis, characterization and up-conversion photoluminescence properties of Y2O3: Er3+, Yb3+ nano-phosphors for solar cell applications |
| title_sort | synthesis characterization and up conversion photoluminescence properties of y2o3 er3 yb3 nano phosphors for solar cell applications |
| topic | DRNTU::Engineering::Materials |
| url | http://hdl.handle.net/10356/42434 |
| work_keys_str_mv | AT gohleeser synthesischaracterizationandupconversionphotoluminescencepropertiesofy2o3er3yb3nanophosphorsforsolarcellapplications |