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Träfflista för sökning "L773:1560 8034 OR L773:1605 6582 "

Sökning: L773:1560 8034 OR L773:1605 6582

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1.
  • Kalustova, D. O., et al. (författare)
  • RGBW lighting systems : Influence of the white LED
  • 2022
  • Ingår i: Semiconductor Physics, Quantum Electronics & Optoelectronics. - : National Academy of Sciences Ukraine ; Institute of Semiconductor Physics. - 1560-8034 .- 1605-6582. ; 25:1, s. 76-82
  • Tidskriftsartikel (refereegranskat)abstract
    • People spend most of the time under artificial light sources, so it is important to create a comfortable lighting environment for work and rest. Four-component RGBW systems are the most effective for this. It is needed to create methods for obtaining white light with the specified parameters and choose the most optimal LED components. In this work, the influence of the white LEDs parameters on the resulting white light of the RGBW systems is studied. Two different methods proposed by us earlier for obtaining white light are applied for three RGBW systems with different warm white LEDs. It is shown that the use of white LEDs with a colour rendering index close to 80 is more optimal for most applications. In this case, they provide the resulting white light with the colour rendering index above 90 and luminous efficacy above 130 lm/W.
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2.
  • Rudko, G.Yu, et al. (författare)
  • Optically detected magnetic resonance study of relaxation/emission processes in the nanoparticle-polymer composite
  • 2019
  • Ingår i: SPQEO. - Kiev, Ukraine : Natsional'na Akademiya Nauk Ukrainy * Instytut Fizyky Napivprovidnykiv. - 1605-6582. ; 22:3, s. 310-318
  • Tidskriftsartikel (refereegranskat)abstract
    • Two nanocomposites containing CdS nanoparticles in polymeric matrices were studied using the photoluminescence (PL) and optically detected magnetic resonance (ODMR) methods. Due to equal sizes of NPs in the composites (~5 nm) but different matrices – the oxygen-containing polymer PVA (polyvinyl alcohol) and oxygen-free polymer PEI (polyethyleneimine) – differences of nanocomposites properties are predominantly caused by different interfacial conditions. ODMR spectra have revealed five types of centers related to the PL emission – four centers involved in radiative recombination and one center related to non-radiative recombination processes. The oxygen-related interfacial center in CdS/PVA (LK1-center) and sulfur vacancy center in CdS/PEI (Vs-center) were identified.
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