All-perylene-derivative white light emitting diode


Everton Pereira Andrade, Samuel Brum Martins, Eduardo Policarpo, Subodh Gautam, Olivier Plantevin, Luciano Roni Silva Lara, Humberto Stumpf, Gustavo Azevedo, Mário Sérgio Mazzoni, Luiz Alberto Cury, Angelo Malachias, Walace Doti do Pim, and Gustavo Almeida Magalhaes de Safar. 2020. “All-perylene-derivative white light emitting diode.” Phys. Chem. Chem. Phys., Pp. -.


An organic-based bright white light emitting compound, namely Tb(H3PTC)3, able to be used as part of a white diode and as a part of a RGB system that can withstand high temperatures (∼700K), is developed using perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA) and terbium(III) nitrate pentahydrate as precursors in its hydrothermal synthesis. Using PTCDA as the red emitter and the new derivative of it, Tb(H3PTC)3, as the blue-green emitter, along with a common deep blue LED can form a RGB system for display technologies, around room temperature. Temperature-dependent photoluminescence properties of the Tb(H3PTC)3 compound are also investigated for the involved excitonic-emission processes and the respective recombination lifetimes. The terbium(III) complex was prepared using a procedure that is reproducible, easily modifiable, inexpensive, and environmentally friendly, opening new pathways for its large-scale application. Unlike PTCDA, Tb(H3PTC)3 has shown to be soluble in N-methyl-2-pyrrolidone (NMP) as well as in dilute aqueous solution of this organic solvent in a straightforward procedure. The light emission properties are intimately correlated with the molecular structure and electronic properties of Tb(H3PTC)3 elucidated by experimental results of X-ray Absorption Near Edge Spectroscopy (XANES), Extended X-ray Absorption Fine Structure (EXAFS) and Density Functional Theory (DFT) calculations. A bright fluorescence yield is attained with a small amount of material either in solution or in solid form showing its potential to be used in state-of-the-art organic optoelectronic devices.