| Yazarlar |
Gönül Eryürek
İstanbul Teknik Üniversitesi, Türkiye |
|
Hatun Çınkaya Yılmaz
İstanbul Teknik Üniversitesi, Türkiye |
|
Murat Erdem
Marmara Üniversitesi, Türkiye |
Gökhan BİLİR
Kafkas Üniversitesi, Türkiye |
| Özet |
| We report the luminescence properties of undoped and 10% Yb3-doped Y2Si2O7 nanopowders under the infrared excitation of 975-nm laser diode. A broadband white light (WL) emission is observed in the undoped powder, and its intensity becomes stronger with increasing excitation power. A blue emission centered at ∼475 nm is observed below the excitation power of ∼2 W in the Yb3-doped sample. The blue emission intensity dependence on the excitation power suggests that this emission is a two-photon absorption process known as the cooperative luminescence of Yb3 ions. When the excitation power is increased above 2 W, a broadband white emission extending from blue into the near infrared appears while the blue cooperative emission band of Yb3 ions disappears. The excitation power dependence of theWL intensity at 758 nm is due to a multiphoton process that may be attributed to the thermal radiation mechanism. The International Commission on Illumination coordinates (x; y) for the WL emission in the Yb3-doped Y2Si2O7 nanocrystalline sample is found to be (0.4503, 0.3999) and (0.5035, 0.4096) for 2.005- and 3.68-W excitation powers, respectively. These values lie in the yellowish region and correspond to the color temperature value of 5030 K, with a color rendering index of 85. |
| Anahtar Kelimeler |
| Y2Si2O7;Yb3+ | laser spectroscopy | white light emission |
| Makale Türü | Özgün Makale |
| Makale Alt Türü | SSCI, AHCI, SCI, SCI-Exp dergilerinde yayımlanan tam makale |
| Dergi Adı | JOURNAL OF NANOPHOTONICS |
| Dergi ISSN | 1934-2608 |
| Dergi Tarandığı Indeksler | SCI-Exp, SCOPUS, Curation, Current Contents Engineering Computing & Technology, Current Contents Physical Chemical & Earth Sciences, Essential Science Indicators, Reference Master, Sophia |
| Makale Dili | İngilizce |
| Basım Tarihi | 04-2016 |
| Cilt No | 10 |
| Sayı | 2 |
| Sayfalar | 26022 / 0 |
| Doi Numarası | 10.1117/1.JNP.10.026022 |
| Makale Linki | http://nanophotonics.spiedigitallibrary.org/article.aspx?doi=10.1117/1.JNP.10.026022 |
| Atıf Sayıları | |
| WoS | 12 |
| SCOPUS | 10 |
| ResearchGate | 9 |
| Google Scholar | 12 |
