Acta Optica Sinica, Volume. 33, Issue s1, 116003(2013)
Mechanism for 1 μm Photoluminescence in Yb3+/Li+ Codoped Y2O3 Nanoparticles
Y2O3 nanoparticles codoped with Yb3+/Li+ ions are synthesized by glycine combustion method. Codoping with 5% mole fraction of Li+ ions leads to about 12 times enhancement of the photoluminescence (PL) intensity around 1 μm under diode laser excitation of 940 nm. The movements of the X-ray main diffraction peak indicate that the codoping of Li+ ions changes the lattice environment of Yb3+ ions. Theoretical investigations based on the steady-state rate equations indicate that the PL enhancement arises mainly from the increased ground state absorption cross section of Yb3+ ions by codoping with Li+ ions. The codoping of Li+ ions can disturb the local crystal field around the Yb3+ ions in Y2O3 crystals, change the PL transition selection rules of Yb3+ ions, resulting in enhanced intra-4f electric-dipole transitions and oscillator strength, which leads to the increase of ground state absorption cross section.
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Fan Ting, Lü Jiantao, Li Na. Mechanism for 1 μm Photoluminescence in Yb3+/Li+ Codoped Y2O3 Nanoparticles[J]. Acta Optica Sinica, 2013, 33(s1): 116003
Category: Materials
Received: Jan. 18, 2013
Accepted: --
Published Online: Jun. 7, 2013
The Author Email: Ting Fan (everting82@yahoo.com.cn)