Recently, Ph.D. student Hongyuan
Zhu from BEBC has published his first author review in Journal of Luminescence entitled " A modified energy transfer model for determination
of upconversion emission of β-NaYF4:Yb,Er: Role of self-quenching effect ".
The paper introduced A
modified energy transfer model by incorporating self-quenching effect to
determine upconversion emission of β-NaYF4:Yb,Er. The simulation results agree
well with existing experimental results, demonstrating the critical role of
self-quenching effect in upconversion emission. The modeling results confirm
that a 4.4-fold increase of green upconversion and 86-fold increase in the
intensity of red upconversion emission could be realized by suppressing
self-quenching. In addition, the optimal doping concentrations for integral
emission intensity are found to be independent of excitation power, while the
green to red ratio is found to rely significantly on excitation power. The
model offers mechanistic insight into upconversion emission processes and
provides inspirations in improving upconversion emission efficiency through
optimization of energy transfer pathways in different types of matrix
sub-lattice.
The work is under the
guidance of vice professor Min Lin and professor Feng Xu. The co-authors of the
paper include associate professor Min Lin, associate professor Guorui Jin, professor Tianjian
Lu, and Professor Feng Xu.