Pereira-Andrade E, Brum S M, Policarpo E M C, Gautam S K, Plantevin O, Lara L R S, Stumpf H O, Azevedo G M, Mazzoni M S C, Cury L A, Malachias A, do Pim W D, Sáfar G A M
Departamento de Física, Instituto de Ciências Exatas, Universidade Federal de Minas Gerais, Av. Antônio Carlos, 6627, Belo Horizonte, Minas Gerais, Brazil.
Centre de Sciences Nucléaires et de Sciences de la Matière, CNRS-IN2P3-Univ. Paris-Sud, Université Paris-Saclay, Bâtiment 104-108, Campus d'Orsay, 91 405 Orsay Cedex, France.
Phys Chem Chem Phys. 2020 Sep 23;22(36):20744-20750. doi: 10.1039/d0cp02718a.
An organic-based bright white light emitting compound, namely Tb(H3PTC)3 [H4PTC = perylene-3,4,9,10-tetracarboxylic acid], able to be used as part of a white diode and as a part of a RGB system that can withstand high temperatures (∼700 K), is developed using perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA) and terbium(iii) nitrate pentahydrate as precursors by 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 applications. Unlike PTCDA, Tb(H3PTC)3 has been shown to be soluble in N-methyl-2-pyrrolidone (NMP) as well as in dilute aqueous solutions 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.
一种基于有机的亮白色发光化合物，即Tb(H3PTC)3 [H4PTC = 苝-3,4,9,10-四羧酸]，它能够用作白色二极管的一部分以及RGB系统的一部分，且能承受高温（约700 K）。该化合物通过水热合成法，以苝-3,4,9,10-四羧酸二酐（PTCDA）和硝酸铽(iii)五水合物作为前驱体制备而成。在室温左右，使用PTCDA作为红色发射体，其新衍生物Tb(H3PTC)3作为蓝绿色发射体，再加上一个普通的深蓝色发光二极管（LED），可以形成用于显示技术的RGB系统。还研究了Tb(H3PTC)3化合物的温度依赖光致发光特性，以了解其中涉及的激子发射过程和各自的复合寿命。铽(iii)配合物的制备过程具有可重复性、易于修改、成本低廉且环境友好的特点，为其大规模应用开辟了新途径。与PTCDA不同，已证明Tb(H3PTC)3可直接溶于N-甲基-2-吡咯烷酮（NMP）以及该有机溶剂的稀水溶液中。通过X射线吸收近边光谱（XANES）、扩展X射线吸收精细结构（EXAFS）和密度泛函理论（DFT）计算的实验结果表明，发光特性与Tb(H3PTC)3的分子结构和电子性质密切相关。无论是溶液形式还是固体形式，少量该材料就能获得较高的荧光产率，可以看出它在先进有机光电器件中具有应用潜力。
