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https://hdl.handle.net/11147/7056
Title: | White LED light production using dibromoperylene derivatives in down conversion of energy | Authors: | Aksoy, Erkan Demir, Nuriye Varlıklı, Canan |
Keywords: | Downconversion Organic phosphor Perylene PMMA White light |
Issue Date: | 2018 | Publisher: | Canadian Science Publishing | Source: | Aksoy, E., Demir, N., and Varlıklı, C. (2018). White LED light production using dibromoperylene derivatives in down conversion of energy. Canadian Journal of Physics, 96(7), 734-739. doi:10.1139/cjp-2017-0752 | Abstract: | Perylene derivatives of N,N′-bis(2,6-diisopropylphenyl)-1,6(7)-dibromoperylene-3,4,9,10-tetracarboxylic diimide (DBrPDI) and 1,7-dibromo perylene-3,4,9,10-tetracarboxylic acid butyl ester (DBrPTE) were synthesized, and their structural and optical characterizations were explored. Both DBrPDI and DBrPTE, which were utilized as wavelength converters on a GaN/InGaN based blue LED, were singlet sensitizers and had molar absorptivity constants around 104 Lmol-1cm-1. The blue LED that was used had Commission internationale de l'eclairage (CIE) coordinates of x, y = 0.13, 0.06; power and luminous efficiencies of 2.7 lm/W and 6.6 cd/A @5 mA, respectively. Because the fluorescence quantum yield of DBrPDI was much higher than that of DBrPTE, a meaningful white light efficiency was obtained with the diimide derivative. The use of DBrPDI resulted in white light with CIE coordinates of x, y = 0.34, 0.29 and luminous efficiency of 6.35 cd/A @5 mA, respectively. Using DBrPDI in a resin matrix resulted in more than three orders of magnitude increase in the luminous efficiency value (23.0 cd/A @5 mA) while the CIE coordinates remained the same. Whenever the applied current reached 20 mA, a CRI value of Ra = 90 was obtained. | Description: | This paper is part of a Special Issue entitled the 33rd International Physics Conference of Turkish Physical Society. | URI: | https://doi.org/10.1139/cjp-2017-0752 http://hdl.handle.net/11147/7056 |
ISSN: | 0008-4204 |
Appears in Collections: | Photonics / Fotonik Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection |
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