Title: A study on correlation between corrosion resistance and flexibility in Copper plating

Biography:

Prof. Jung Hyun Jeong, now is a professor of department of physics in Pukyong National University. He got his B.Sc. and M.Sc. in physics at Pusan National University, doctor's degree (Ph.D.) at Tsukuba University in Japan. He is the chairman for many researches, such as Physics Center for Functional Condensed Matters of Brain Korea (BK) 21 Plus and Creative Korea (CK) project

Abstract

Series of Er³⁺-activated NaSrLa(MoO₄)₃ phosphors were prepared by a traditional solid-state reaction technique. At 378 nm excitation, the obtained compounds displayed stronger green emissions that can be seen by naked eye. As the increment of Er³⁺ ion concentration, the emission intensity increased and reached its maximum value when the doping concentration was 4 mol%. The critical distance was calculated to be 25.32 Å and the dipole-dipole took the domination in the concentration quenching mechanism. In addition, by means of a fluorescence intensity ratio technique, the temperature sensing performances of the synthesized samples in the temperature range of 303–463 K were investigated based on the thermally coupled levels, ²H_11/2 and ⁴S_3/2, of Er³⁺ ions. It is also found that the doping concentration can influence the sensor sensitivity of Er³⁺-activated NaSrLa(MoO₄)₃ phosphors. These results demonstrate that the Er³⁺-activated NaSrLa(MoO₄)₃ phosphors are promising candidates for simultaneous solid-state lighting and non-contact hermometry