White-Light Emitting Di-Ureasil Hybrids
authors Fang, M; Fu, LS; Ferreira, RAS; Carlos, LD
nationality International
journal MATERIALS
author keywords di-ureasil organic-inorganic hybrids; in situ sol-gel synthesis; white light emission; lanthanide complexes; coumarin 1
keywords METAL-ORGANIC FRAMEWORK; 3 PRIMARY COLORS; COORDINATION POLYMERS; TUNABLE EMISSION; ORGANIC/INORGANIC HYBRIDS; INFRARED TEMPERATURE; MODIFIED SILICATES; INORGANIC HYBRIDS; ENERGY-TRANSFER; QUANTUM YIELDS
abstract White-light emitting materials have emerged as important components for solid state lighting devices with high potential for the replacement of conventional light sources. Herein, amine-functionalized organic-inorganic di-ureasil hybrids consisting of a siliceous skeleton and oligopolyether chains codoped with lanthanide-based complexes, with Eu3+ and Tb3+ ions and 4,4-oxybis(benzoic acid) and 1,10-phenanthroline ligands, and the coumarin 1 dye were synthesized by in situ sol-gel method. The resulting luminescent di-ureasils show red, green, and blue colors originated from the Eu3+, Tb3+, and C1 emissions, respectively. The emission colors can be modulated either by variation of the relative concentration between the emitting centers or by changing the excitation wavelength. White light emission is achieved under UV excitation with absolute quantum yields of 0.148 +/- 0.015, 0.167 +/- 0.017, and 0.202 +/- 0.020 at 350, 332, and 305 nm excitation, respectively. The emission mechanism was investigated by photoluminescence and UV-visible absorption spectroscopy, revealing an efficient energy transfer from the organic ligands to the Ln(3+) ions and the organic dye, whereas negligible interaction between the dopants is discerned. The obtained luminescent di-ureasils have potential for optoelectronic applications, such as in white-light emitting diodes.
publisher MDPI
issn 1996-1944
year published 2018
volume 11
issue 11
digital object identifier (doi) 10.3390/ma11112246
web of science category Materials Science, Multidisciplinary
subject category Materials Science
unique article identifier WOS:000451755500181
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journal analysis (jcr 2017):
journal impact factor 2.467
5 year journal impact factor 3.325
category normalized journal impact factor percentile 61.228
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