Er3+/Yb3+ codoped Gd2O3 nano-phosphor for optical thermometry

Preparation and characterization of stable aqueous suspensions of up-converting Er3+/Yb3+-doped LiNbO3 nanocrystals

“…8, a change in the relative intensity of the 530 nm ( 2 Hn/2 -^-4 Iis/2) and 550 nm ( 4 S3/2 -^-4 Iis/2 ) bands can be observed. These effects have been previously observed in a variety of host materials and attributed to a poor thermal contact between the nanoparticles, which favors a local temperature increase during optical excitation [29][30][31]. Since the energy gap between both emitting multiplets is relatively low (around 800 cm _1 ), they are thermally coupled at ordinary temperatures following a Boltzmann distribution.…”

Thermal and pump power effect in SrMoO4:Er3+-Yb3+ phosphor for thermometry and optical heating

“…The temperature sensing study has been performed in the Er 3+ doped different hosts viz. Y 2 O 3 , Gd 2 O 3 , La 2 O 3 , BaMoO 4 , Yb 2 Ti 2 O 7 , etc., by using NIR laser diode excitation [8,[15][16][17][18][19][20].…”

Quenching of the Luminescence of Upconverting Luminescent Nanoparticles by Heavy Metal Ions

“…The best way to differentiate between static and dynamic quenching is through measurement of decay times (which is strongly affected by static quenching, but not by dynamic quenching). However, the decay times of UCLNPs (which are in the order of 0.5 to 8 ms) [46,47] are quite complex, owing to the many electronic transitions that occur in parallel. A recently published book [48] lists the following features of the luminescence emission of upconverting particle: 1) typical lifetimes of between 200 ms and 5 ms, 2) strongly non-exponential decay profiles (with multiplicities of up to 9), 3) size-dependent decay times, 4) decay times that are different for each transition, and 5) quantum yields that seem to depend on the energy of the excitation light source; this (conceivably) may also affect decay times.…”