We evaluated the influence of impurities in the vacuum chamber used for the fabrication of organic light-emitting diodes on the lifetime of the fabricated devices and found a correlation between lifetime and the device fabrication time. The contact angle of the ITO substrates stored the chamber under vacuum were used to evaluate chamber cleanliness. Liquid chromatography-mass spectrometry was p...

Introduction: Recent observation by infrared spectroscopy has revealed the presence of amorphous and/or crystalline silicate dusts around evolved stars or young star discs [e.g., 1-4]. The species, size, shape, composition, and orientation if they are crystalline, of the dusts control the optical properties of dusts, which further control the radiation field of discs. Thus, the formation and gr...

Evaporation properties of Monel and stainless-steel alloy materials that are widely applied in microwave vacuum electron devices have been studied by time-of-flight mass spectrometry (ToFMS) as their evaporants has an immediate impact on lifetime reliability. The composition sizes stainless steel determined. Minor evaporation Mn, Cu, Cr occurred at ∼800°C, which is much lower than the melting p...

This paper proposes results on calculation of the back flux for the case of pulsed laser evaporation into vacuum. On the basis of the direct Monte Carlo simulation, one-dimensional plane expansion of vapor cloud was calculated for a wide range of the number of evaporated monolayers. A substantial back flux rise is observed if the rotational degrees of freedom are taken into account. Influence o...

This work presents a novel technique to deposit ZnO thin films through a metal vacuum evaporation technique using colloidal nanoparticles (average size of 30 nm), which were synthesized by our research group, as source. These thin films had a thickness between 45 and 123 nm as measured by profilometry. XRD patterns of the deposited thin films were obtained. According to the HRSEM micrographs wo...