A green- emitting a- substituted a- diketonate Tb3+phosphor for ultraviolet LED- based solid- state

authors	Nolasco, MM; Vaz, PM; Vaz, PD; Ferreira, RAS; Lima, PP; Carlos, LD
nationality	International
journal	JOURNAL OF COORDINATION CHEMISTRY
author keywords	Tb3+ and Gd3+ complexes; -Substituted -acetylacetonate; Photoluminescence; LED; TD-DFT
keywords	RARE-EARTH; ENERGY-TRANSFER; QUANTUM YIELD; LUMINESCENCE; COMPLEX; PHOSPHORS; DENSITY; LIGAND; DIPHENYLETHYNE; TERBIUM(III)
abstract	The -substituted -diketonate [Ln(3Cl-acac)(3)(H2O)(2)] [Ln=Tb, Gd] complexes (with 3Cl-acac(-) being 3-chloro-2,4-pentanedionate) were characterized by elemental analysis, infrared, ultraviolet (UV)-visible and photoluminescence spectroscopies. For comparison purposes regarding photoluminescence, the well-known [Tb(acac)(3)(H2O)(2)] complex was also synthesized. By considering the phosphorescence spectra of [Gd(3Cl-acac)(3)(H2O)(2)], the effect of chloride replacement of hydrogen on the triplet state energy of the 3Cl-acac ligand was revealed. To support the interpretation and rationalization of the experimental results, Time-dependent DFT calculations were performed on Tb(3Cl-acac)(3)(H2O)(2). Additionally, the possibility of Tb(3Cl-acac)(3)(H2O)(2) to be used as potential green-emitting phosphor material for solid-sate light emitting diodes was evaluated. A prototype was successfully fabricated coating a near-UV LED (370nm) with the Tb(3Cl-acac)(3)(H2O)(2) complex.
publisher	TAYLOR & FRANCIS LTD
issn	0095-8972
year published	2014
volume	67
issue	23-24
beginning page	4076
ending page	4089
digital object identifier (doi)	10.1080/00958972.2014.969722
web of science category	Chemistry, Inorganic & Nuclear
subject category	Chemistry
unique article identifier	WOS:000345454600025