Optical and spectral characterization of Er3+/Yb3+-codoped NAT ceramics

✍ Scribed by N.Q. Wang; X.J. Li; E.Y.B. Pun; H. Lin; D.L. Yang

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 470 KB
• Volume: 404
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/j.physb.2008.12.004

✦ Synopsis

Er 3+ /Yb 3+ -codoped aluminum oxide (Al 2 O 3 ) modified tellurite ceramics have been prepared by hightemperature melting. Judd-Ofelt parameters of Eu 3+ , which was introduced in 15%Na 2 O-15%Al 2 O 3 -70%TeO 2 (NAT) ceramic system as a probe, present a medium asymmetry and covalence environment around rare-earth ions. Efficient 551 nm green and 668 nm red two-photon pumped upconversion fluorescence and strong 1.533 mm infrared radiation were observed and recorded in the Er 3+ /Yb 3+ -codoped NAT ceramics under the excitation of $980 nm diode lasers. For 1.533 mm near-infrared emission, the maximum stimulated emission cross-section was calculated to be 6.61 Â10 À21 cm 2 , and the ordinary exhibition referring to tellurite glass system is due to the lowering of refractive index, which is caused by the abundance of Al 2 O 3 composition. Efficient visible upconversion and infrared emissions indicate that Er 3+ /Yb 3+ -codoped NAT ceramics are promising substrates in developing color light sources, upconversion display devices, infrared sensors and infrared radiation sources.