Научная сессия и заседание Учёного совета
Повестка дня: 1. Д.К. Жарков, А.В. Леонтьев, А.Г. Шмелев, Л.А. Нуртдинова, А.П. Чукланов, Н.И. Нургазизов и В.Г. Никифоров. Upconversion luminescence response of a single YVO4:Yb, Er particle. We present the results of the luminescence response studies of a single YVO4:Yb, Er particle of 1-µm size. Yttrium vanadate nanoparticles are well-known for their low sensitivity to surface quenchers in water solutions that makes them of special interest for biological applications. First, YVO4:Yb, Er nanoparticles (in the size range from 0.05 µm up to 2 µm) using hydrothermal method were synthesized. Nanoparticles deposited and dried on a glass surface exhibited bright green upconversion luminescence. By means of atomic-force microscope a 60×60 µm2 square of a glass surface was cleaned from any noticeable contaminants (more than 10 nm in size) and a single particle of 1-µm size was selected and placed in the middle. Confocal microscopy revealed significant difference between the collective luminescent response of an ensemble of synthesized nanoparticles (in the form of a dry powder) and that of a single particle. In particular, a pronounced polarization of the upconversion luminescence from a single particle was observed. Luminescence dependences on the laser power are quite different for the single particle and the large ensemble of nanoparticles as well. These facts attest to the notion that upconversion properties of single particles are highly individual. This implies that to use an upconversion particle as a single sensor of the local parameters of a medium, additional studying and calibration of its individual photophysical properties are essential. 2. Разное. |