RESUMOEste artigo analisa a importância atribuída pelos alunos do curso de Administração da Universidade Federal de Santa Catarina às atividades extracurriculares para o alcance dos seus objetivos profissionais. O Objetivo geral configurou-se como: identificar como os alunos desse estudo avaliam a importância do desenvolvimento de atividades extracurriculares durante a vida acadêmica para o alcance dos seus objetivos profissionais; já os objetivos específicos foram: a) identificar as atividades extra-curriculares que os alunos consideram importantes para atingir os seus objetivos profissionais; b) identificar as aspirações profissionais dos ingressos e egressos; c) identificar se os ingressos e egressos planejam suas carreiras; d) verificar como a Instituição em estudo colabora com o oferecimento de atividades extra-curriculares; e) identificar quais as atividades que devem ser desenvolvidas para auxiliar o aluno em estudo na busca de sua realização profissional. Para tanto, esta pesquisa foi classificada como de caráter descritivo e qualitativo, e utilizou-se o método de pesquisa bibliográfica e a pesquisa de campo. Como instrumentos de coleta de dados foram utilizados questionários impressos e eletrônicos. Como resultado, tem-se a falta de orientação desses alunos sobre como selecionar as atividades extra-curriculares que poderão contribuir para o alcance dos seus objetivos profissionais, entre outros conclusões que serão apontados.Palavras-chave: Empregabilidade. Planejamento de carreira. Administração universitária.
The contribution of radiative and non-radiative processes to the electroluminescence emission of OLEDs based on Eu-complex, {tris(thenoyltrifluoroacetone) [1,2,5]thiadiazolo[3,4f][1,10]phenanthroline} europium(III), [Eu(TTA) 3 TDZP], which acts as transporting and emitting layers, is investigated. The Eu-complex presented an intense photoluminescence with high color purity in the red region, characteristic of the Eu(III) 5 D 0 → 7 F 2 narrow line transition. However, when used in a double-layered OLED its electroluminescence showed additional undesired broad bands, which can be attributed to the possible electrophosphorescence of the ligand and to an inefficient energy transfer from the organic ligand to the Eu(III). The characteristic narrow lines could be achieved using a co-deposited active layer with the Eu-complex acting as a dopant in a matrix comprised of 4,4′bis(carbazol-9-yl)biphenyl (CBP).
Luminescent and solution-processable copper(I) complexes offer the perspective of obtaining devices that combine efficiency and stability at low production costs. Here, we investigate Cu(I) complexes with phosphine and 1,10-phenanthroline-derived ligands, which show thermally activated delayed fluorescence (TADF) and phosphorescence applied to allsolution processed multilayer OLEDs. Unsubstituted, thiadiazole-substituted and selenodiazole-substituted phenanthroline ligands were compared to evaluate the potential of the incorporation of sulfur and selenium atoms to enhance the device performance. A shortening of the photoluminescence lifetime of the selenium-containing emitter was found to compensate this emitter's lower emission yield, leading to devices of comparable performance to devices based on the more efficiently emitting unsubstituted phenanthroline complex. The results indicate that the emission lifetime reduction is a promising approach to improve OLEDs based on solutionprocessable Cu(I) complexes.
The low efficiency of organic light-emitting diodes based on lanthanide complexes is generally attributed to the triplet-triplet annihilation processes in the regime of high concentration of excited states caused by their long lifetimes and optical losses near the interfaces of multilayer device structures. Despite the enormous effort to synthesize short-lived complexes and minimize the optical losses in the interfaces, it remains insufficient in understanding the exciton recombination processes that reduce the lifetime of these complexes. Herein, we investigated the influence of the exciton recombination processes on a Tb complex (Tb-C) lifetime in the regime of a highly excited state concentration as a function of the distance between the carrier layer and the interface by using a typical organic light-emitting diode structure. Our results show that a 10 nm-thick Alq3 layer decreases the exciton lifetime of the Tb-C, increasing approximately by 16 times the spontaneous emission decay rate of triplet exciton. The effects of interference and optical losses at the metallic interface contribute actively to the modulation of the emission intensity and lifetime decay. However, these effects alone do not explain the significant increase in the emission decay rate. The nonradiative Auger process at the Alq3/Tb-C interface seems to be largely accountable for the Tb-C lifetime reduction as the energy released by the terbium ion occurs by the excitation of an adjacent electron at higher energy. Furthermore, we propose a simple theoretical model to explain the observed effects. These results can provide a new approach to reduce the lanthanide complexes’ lifetime through the Auger electron process near the interface and thus improve the performance of organic light-emitting diodes.
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