Multiple scattering effect on luminescence properties of organic luminophors

• Main Authors: Tikhonov, E., Yashchuk, V.P., Prygodyuk, O., Bezrodny, V., Filatov, Yu.
• Format: Article
• Language: English
• Published: НТК «Інститут монокристалів» НАН України 2004
• Series: Functional Materials
• Online Access: http://dspace.nbuv.gov.ua/handle/123456789/135254

Luminescence properties of the multiple-scattering rhodamina 6 G solutions in solid polymers as functions of scattering efficiency and sample thickness have been investigated. It was found that luminescence spectrum (LS) as well as integrated (over the spectrum) intensity observed in the direction backward to the excitation beam depend significantly on the scattering efficiency being varied using changes of the concentration and refractive index of the embedded scattering microparticles. The integrated intensit y increases with the particle concentration increase. This increasing is due to spatial red is-tribution of luminescence radiation when being multiply scattered in the sample as well as to additional absorption of the excitation light. The LS dependence on the scattering efficiency is caused by reabsorption of the luminescence radiation in the sample. Thus, varying the reabsorption allows tuning the LS maximum over the 20 nm range. Two possible methods of the LS tuning using the sample thickness and scattering efficiency variations were investigated. The second tuning method is preferable because energy efficiency of the sample remains unchanged.