کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1617560 | 1005689 | 2011 | 5 صفحه PDF | دانلود رایگان |

Mn2+ is an excellent luminescent ion with variable color from green, yellow to red in different hosts and has been widely utilized in recent years. The luminescent intensity of Mn2+ in many hosts is so low that the correlative application is restricted. In the present paper, two methods, i.e. employing a charge compensator and introducing a sensitizer, were adopted to enhance the luminescence of Mn2+ in Y3Al5O12 (YAG). By employing Si4+ as a charge compensator, the doping content of Mn2+ (x) in Y3MnxAl5−2xSixO12 can be lifted up to 0.4. Mn2+ in YAG emits orange light in a broad band. The peak wavelength shifts from 586 to 593 nm with the increasing x. The luminescent intensity of Mn2+ reaches its maximum when x = 0.1. Co-doping Tb3+ into Mn2+ doped YAG, the sensitization effect of Tb3+ on Mn2+ was observed clearly. The resonance energy transfer from Tb3+ to Mn2+ occurs because there is a well overlapping between emission spectrum of Tb3+ and excitation spectrum of Mn2+. A reasonable explanation for the sensitization effect of Tb3+ on the luminescence of Mn2+ was brought forward.
▶ Tb3+ in YAG can emit two groups of lights which correspond to the transitions from 5D3 and 5D4 to 7FJ (J = 6, 5, 4, 3), respectively. Mn2+ in YAG has several excitation bands corresponding to the transitions from ground state 6A1 (6S) to excited states 4T2 (4G), 4A1 (4G), 4T2 (4D), 4E (4D), 2A1 (4D), and so on. From above figure, the transition of Mn2+ from 6A1 (6S) to 4E (4D) or 2A1 (4D) has equal energy with the transition of Tb3+ from 5D3 to 7F5, so does the transition of Mn2+ from 6A1 (6S) to 4T2 (4G) with the transition of Tb3+ from 5D4 to 7F6. The perfect energy matching between the emission of Tb3+ and the absorption of Mn2+ results in the occurrence of the energy transfer from Tb3+ to Mn2+ which enhances the luminescence of Mn2+ in YAG remarkably.Figure optionsDownload as PowerPoint slideHighlights
► The solubility of Mn2+ in Y3MnxAl5−2xSixO12 can be lifted up when Si4+ exists as a charge and volume compensator.
► Mn2+ in Y3MnxAl5−2xSixO12 emits broadband orange light (peak wavelength varies from 586 nm to 593 nm).
► Tb3+ in phosphors Y3−yTbyMnxAl5−2xSixO12 can enhance the luminescence of Mn2+ remarkably. The energy transfer from Tb3+ to Mn2+ occurs and the reasonable explanation is given out.
Journal: Journal of Alloys and Compounds - Volume 509, Issue 22, 2 June 2011, Pages 6476–6480