Time resolved fluorescence and energy transfer analysis of Nd(3+)-Yb (3+)-Er (3+) triply-doped Ba-Al-metaphosphate glasses for an eye safe emission (1.54 microm).
This paper reports on the preparation and systematic analysis of energy transfer mechanisms in Nd(3+)-Yb(3+)-Er(3+) co-doped new series of barium-alumino-metaphosphate glasses. The time resolved fluorescence of Nd(3+) in triply doped Ba-Al-metaphosphate glasses have revealed that, Yb(3+) ions could function as quite efficient bridge for an energy transfer between Nd(3+) and Er(3+) ions. As a result, a fourfold emission enhancement at 1.54 mum of Er(3+) ions has been achieved through an excitation of (4)F(5/2) level of Nd(3+) at 806 nm for the glass having 3 mol% Yb(3+) with an energy transfer efficiency reaching up to 94%. Decay of donor (Nd(3+)) ion fluorescence has been analyzed based on theoretical models such as direct energy transfer model (Inokuti-Hirayama) and migration assisted energy transfer models (Burshtein's hopping and Yokota-Tanimoto's diffusion). The corresponding energy transfer parameters have been evaluated and discussed. Primarily, electrostatic dipole-dipole (s approximately 6) interactions are found to be responsible for the occurrence of energy transfer process in theses glasses.
Sontakke
Atul D
AD
Glass Technology Laboratory, Council of Scientific and Industrial Research, Central Glass and Ceramic Research Institute, 196, Raja S.C. Mullick Road, Kolkata, 700032, India.
Biswas
Kaushik
K
Mandal
Ashis K
AK
Annapurna
Kalyandurg
K
D000042:Absorption; D000535:Aluminum / Q000737:chemistry*; D001464:Barium / Q000737:chemistry*; D004735:Energy Transfer; D004871:Erbium / Q000737:chemistry; D005123:Eye; D005898:Glass / Q000737:chemistry*; D008674:Metals, Rare Earth / Q000737:chemistry*; D009354:Neodymium / Q000737:chemistry; D055620:Optical Phenomena; D010710:Phosphates / Q000737:chemistry*; D012449:Safety; D013050:Spectrometry, Fluorescence; D013055:Spectrophotometry, Infrared; D013997:Time Factors; D015018:Ytterbium / Q000737:chemistry
D008674:Metals, Rare Earth; D010710:Phosphates; D001464:Barium; D009354:Neodymium; D004871:Erbium; D000535:Aluminum; D015018:Ytterbium