Yb ~ (3)-Er ~ (3) powder doped 12CaO · 7Al_2O_3 upconversion

Title: Yb ~ (3)-Er ~ (3) powder doped 12CaO · 7Al_2O_3 upconversion
Author: still open
Degree-granting units: Northeast Normal University
Keywords: 12CaO · 7Al_2O_3;; conversion;; energy transfer
Summary:


Doped sol-gel method was Yb ~ (3)-Er ~ (3) ions 12CaO · 7Al_2O_3 (C12A7: Yb-Er) up-conversion (UC) powder, issued in the 980 nm diode laser excitation will produce infrared high-intensity visible light emission. UC issued showing yellow-green or light green, Magnetic lifter covering the spectrum of purple, blue, green and red band (peak followed at 408, 483,520 / 540, and 660 nm) corresponding to the Er ~ (3) ion ~ 2H_ (9 / 2) → ~ 4I_ (15 / 2), ~ 4F_ (7 / 2) → ~ 4I_ (15 / 2), ~ 2H_ (11 / 2 / ~ 4S_ (3 / 2) → ~ 4I_ (15 / 2) and ~ 4F_ (9 / 2) → ~ 4I_ (15 / 2) of the band gap transition.


C12A7: Yb-Er X-ray powder diffraction patterns and scanning electron microscopy (SEM) observations showed that powder particle size of 200-300 nm, emission mainly from UC that C12A7: Yb-Er particles of body effect and non-surface effect. http://www.999magnet.com/products/131-magnetic-lifter Define the green light relative to other excitation band with the integral intensity ratio R, monitor the R-value distribution between roughly 1-14. With Yb ~ (3) the increase in ion concentration, R value decreases. Yb ~ (3) ion concentration on the spectral intensity distribution modulation UC plays an important role.
Degree Year: 2010