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|Title:||A green- emitting a- substituted a- diketonate Tb3+phosphor for ultraviolet LED- based solid- state|
|Author:||Nolasco, Mariela M.|
Vaz, Patricia M.
Vaz, Pedro D.
Ferreira, Rute A. S.
Lima, Patricia P.
Carlos, Luis D.
|Publisher:||TAYLOR & FRANCIS LTD|
|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.|
|Appears in Collections:||CICECO - Artigos|
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|A green-emitting α-substituted β-diketonate Tb3+ phosphor for ultraviolet LED-based solid-state lighting_10.108000958972.2014.969722.pdf||928.84 kB||Adobe PDF|
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