A green- emitting a- substituted a- diketonate Tb3+phosphor for ultraviolet LED- based solid- state
| Autor: | Luís D. Carlos, Pedro D. Vaz, Patrícia P. Lima, Rute A. S. Ferreira, Patrícia A. A. M. Vaz, Mariela M. Nolasco |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Photoluminescence
Infrared Phosphor 02 engineering and technology 010402 general chemistry Photochemistry medicine.disease_cause 01 natural sciences RARE-EARTH law.invention DIPHENYLETHYNE law Materials Chemistry medicine Physical and Theoretical Chemistry Triplet state COMPLEX QUANTUM YIELD Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences Solid-state lighting PHOSPHORS DENSITY LUMINESCENCE Physical chemistry LIGAND 0210 nano-technology Phosphorescence ENERGY-TRANSFER Ultraviolet Light-emitting diode TERBIUM(III) |
| Zdroj: | Repositório Científico de Acesso Aberto de Portugal Repositório Científico de Acesso Aberto de Portugal (RCAAP) instacron:RCAAP |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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