Browsing by Publisher "National Institute of Optoelectronics"

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    Functionalized bay-substituted perylene diimide additives for inverted organic photovoltaic devices based on P3HT/PCBM
    (National Institute of Optoelectronics, 2015) Dinçalp H.; Çmen O.; Murat Saltan G.; Çl S.
    The photovoltaic performances of inverted organic solar cells including P3HT:PCBM active layer with perylene diimides (PDIs) substituted with different subunits at bay positions of perylene ring were investigated. The improvement of photoluminescence intensity for P3HT:PCBM blend was achieved by the increase of PDI1 additive amount from 6.6 to 10 wt%. In P3HT:PDI1:PCBM ternary blend, preliminary results obtained from cell measurements indicated that PDI1 dopant has improved the cell efficiency by 38% compared to the control cell. Carrier mobility studies revealed that electron or hole mobility capacities of the perylene additives in ternary blends gave a more detailed explanation for efficiencies both binary and ternary systems.
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    On the fourth atom-bond connectivity index of nanocones
    (National Institute of Optoelectronics, 2015) Aslan E.
    Atom bond connectivity index is a topological index was defined as ABC(G) = (Formula Present) where d(v) denotes the degree of vertex v of G. Recently, M. Ghorbani et al. introduced a new version of atom-bond connectivity (ABC4) index as ABC4(G) = (Formula Present) where Su=∑vεENG(u) dv and NG(u) = {v εV(G)luv ε(G)}. In this paper we compute the fourth atom-bond connectivity index for nanocones. © 2015, National Institute of Optoelectronics. All rights reserved.
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    Passive thermal management of an OLED TV display
    (National Institute of Optoelectronics, 2018) Nil M.; Öztürk Y.; Akgül M.B.; Çatalbaş M.C.; Nil M.
    In this study, passive thermal management of a 15’’ OLED TV display is studied. In addition to the OLED display, the effect of other heat generating electronic components on the device is taken into account. Experimental temperature measurements are conducted on the OLED display. The CFD model of the device is developed in order to be able to predict the temperatures and validated with experimental results. A good agreement is obtained between CFD simulation and experimental measurements. To eliminate hot spots and homogenize the tem perature distribution, heat spreaders like copper and graphite are used and the effects of them are discussed in detail. © 2018, National Institute of Optoelectronics. All rights reserved.