Two- and three-photon upconversion of LaOBr:Er3+

✍ Scribed by Hai Guo

• Book ID: 103876322
• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 166 KB
• Volume: 29
• Category: Article
• ISSN: 0925-3467
• DOI: 10.1016/j.optmat.2006.10.016

✦ Synopsis

In this work, the LaOBr:Er 3+ (0.1%) powders were prepared by solid state reaction. The structural properties of LaOBr:Er 3+ were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and Raman spectroscopy. The results show that LaOBr:Er 3+ has low phonon energy, which indicate that LaOBr:Er 3+ may have high luminescent efficiency. Under excitation into 4 I 11/2 level of Er 3+ ions by 980 nm laser, the two-and three-photon upconverted luminescence of LaOBr:Er 3+ were recorded. The most intense emissions were come from the 2 H 11/2 , 4 S 3/2 ! 4 I 15/2 transitions. The upconversion mechanisms were studied in detail through laser power dependence, and results show that excited state absorption is responsible for the upconversion. The upconversion properties indicate that LaOBr:Er 3+ may be used in upconversion phosphors.