Synthesis and up-conversion luminescence of Er(3+) and Y b(3+) codoped nanocrystalline tetra- (KLaP4O12) and pentaphosphates (LaP5O14).
The up-converting nanocrystals of KLa0.95Er0.05Y bxP4O12 and La0.95-xEr0.05Y bxP5O14 were prepared using co-precipitation method. The spectroscopic properties of these materials were investigated in a function of Y b(3+) concentration. The up-conversion emission, power dependence of emission intensities, and the luminescence decay times were investigated. It was found that the green to red and (2)H11/2 → (4)I15/2 to (4)S3/2 → (4)I15/2 emission intensity ratio were strongly affected by the Y b(3+) concentration. Moreover, the order of up-conversion emission and threshold power rises up with Y b(3+) concentration for (4)S3/2 → (4)I15/2 transition. The luminescence decay time of the (4)S3/2 → (4)I15/2 emission increases with Y b(3+) concentration while the (4)F9/2 → (4)I15/2 emission is independent of dopant concentration. The influence of the Y b(3+) concentration on the up-conversion emission intensities was discussed in terms of concentration dependent hetero looped photon avalanche process. A comparison of the up-conversion properties of KLa0.95Er0.05Y bxP4O12 and La0.95-xEr0.05Y bxP5O14 nanocrystals was presented.
Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Wroclaw, Poland.
L
L
Marciniak
Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Wroclaw, Poland.
M
M
Stefanski
Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Wroclaw, Poland.
R
R
Tomala
Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Wroclaw, Poland.
D
D
Hreniak
Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Wroclaw, Poland.
W
W
Strek
D004871:Erbium / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D053758:Nanoparticles; D010710:Phosphates / Q000737:chemistry*; D014961:X-Ray Diffraction; D015018:Ytterbium / Q000737:chemistry*
D010710:Phosphates; D004871:Erbium; D015018:Ytterbium