Abstract
Doping concentration optimized CaSc2O4:0.004Tm3+/0.1Yb3+ shows stronger upconversion luminescence (UCL) than doping concentration also optimized typical oxide upconverting phosphor Y2O3:0.004Tm3+/0.1Yb3+ upon 980 nm laser diode pump. The two-step up converted 3H4 → 3H6 near infrared emission peaked around 800 nm and the three-step up converted 1G4 → 3H6 blue emission around 480 nm of Tm3+ is enhanced by a factor of 3.5 and 2.2, respectively. On analyzing the 2F5/2 → 2F7/2 emission intensities and decay curves of Yb3+ in the two hosts, we reveal that Yb3+ in CaSc2O4 exhibits both a larger absorption cross section at 980 nm and Yb3+ → Tm3+ first step energy transfer coefficient (9.29 × 10−17 cm3 s−1) than that (2.87 × 10−17 cm3 s−1) in Y2O3, indicating that CaSc2O4 is an excellent host for achieving very intense UCL in Tm3+/Yb3+ codoped oxide upconverting materials.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
