OLEDs based on an europium(IIIrpar; complex: {Tris(thenoyltrifluoroacetonate)[1,2,5]‐thiadiazolo[3,4‐f] [1,10]phenanthroline}europium(III) |
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| Authors: | Alessandra Pereira Gilmar Conte Hugo Gallardo César Zucco Welber G. Quirino Cristiano Legnani Marco Cremona Ivan H. Bechtold |
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| Affiliation: | 1. Departamento de Fisica, Universidade Federal de Santa Catarina, Florianópolis, SC, Brasil.;2. Departamento de Quimca ‐ INCT Catálise, Universidade Federal de Santa Catarina, Florianópolis, SC, Brasil.;3. Divis?o de Metrologia de Materiais, Inmetro, Duque de Caxias, 252250‐020, RJ, Brasil.;4. Divis?o de Metrologia de Materiais, Inmetro, Duque de Caxias, 252250‐020, RJ, Brazil, and Departamento de Fisica, PUC‐Rio, Rio de Janeiro, 22451‐900, RJ, Brasil. |
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| Abstract: | Abstract— The contribution of radiative and non‐radiative processes to the electroluminescence emission of OLEDs based on Eu‐complex, {tris(thenoyltrifluoroacetone)[1,2,5]thiadiazolo[3,4‐f][1,10]phenanthroline} europium(III), [Eu(TTA)3TDZP], 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) 5D0 → 7F2 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). |
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| Keywords: | OLEDs rare‐earth compounds electroluminescent complexes energy‐transfer mechanisms |
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