Luminescence Intensity Of Material Research Articles

Influence of Dy3+ doping on the luminescent and piezoelectric properties of bifunctional (K0.48Na0.52) (Nb0.95Sb0.05) O3 based lead-free piezoceramics

With the development of environmental protection and the integration of various materials, multifunctional ceramics have caught significant attention. In this paper, KNNS-xDy ((K0.48Na0.52) (Nb0.95Sb0.05) O3-xDy2O3) ceramics with luminescent and piezoelectric properties were synthesized via conventional high-temperature solid-state method. It was found that the KNNS ceramics doped with the content of 0.4 %Dy had the optimal comprehensive properties and possessed typical characteristics of relaxant ferroelectrics. Particularly, a special thermal quenching phenomenon appeared in the KNNS-0.4 %Dy ceramics and the emission intensity increased by about 15 % after the sample was heated from room temperature up to 75℃. The results showed that the luminescence properties of ferroelectric materials were closely related to the phase structure. The influence of ferroelectric structure on luminescence intensity of materials will be a new research approach in the future.

Enhanced up-conversion luminescent properties of KYb2F7:Er3+ by Sc3+ doping

In the field of up-conversion materials, Yb3+ is usually used as sensitizer. In this work, KYb2F7 is synthesized by hydrothermal method using Yb3+ as a part of the matrix material, and at the same time, the luminescent center Er3+ and the non-luminescent center Sc3+ are co-doped therein. It was found that Yb3+ can be introduced into the matrix material with improved luminescence properties. In addition, with the doping of Sc3+, the luminescence intensity of the material can be increased by up to five times. This testified that the doping of an appropriate amount of non-luminescent center Sc3+ can significantly improve the up-conversion luminescence intensity of up-conversion material.