Abstract
In the search for new multifunctional materials, particularly for application in solid-state lighting, a set of terbium salicylato (Sal) complexes of general composition [Cat][Tb(Sal)4] with the commonly ionic liquid-forming (IL) cations [Cat] = (2-hydroxyethyl)trimethylammonium (choline) (Chol+), diallyldimethylammonium (DADMA+), 1-ethyl-3-methylimidazolium (C2C1Im+), 1-butyl-3-methylimidazolium (C4C1Im+), 1-ethyl-3-vinylimidazolium (C2Vim+), and tetrabutylphosphonium (P4444+) were synthesized. All Tb compounds exhibit strong green photoluminescence of high color purity by energy transfer from the ligand in comparison with what the analogous La compounds show, and quantum yields can reach up to 63% upon ligand excitation. When excited with an HF generator, the compounds show strong green electroluminescence with the same features of mission. The findings promise a high potential of application as emitter materials in solid-state lighting. As an additional feature, the Tb compounds show a strong response to applied external fields, rendering them multifunctional materials.
Highlights
Out of societal and environmental concerns, reducing energy consumption is becoming more and more important.Currently, about 25% of the energy consumed worldwide is for lighting applications.[1,2] a tremendous contribution to energy saving could be made by more energy efficient lighting devices
To perform low temperature measurements, the solid samples were put in quartz capillaries located in a Dewar filled with liquid nitrogen
The set of ionic lanthanum and terbium salicylate complexes with ionic liquid-forming (IL) supporting cations were prepared by combining ethanolic solutions of an equimolar amount of rare earth (RE)(III) salicylate (RE(Sal)3·H2O, RE = La or Tb) and the salicylate IL ([Cat][Sal])
Summary
Out of societal and environmental concerns, reducing energy consumption is becoming more and more important. Article quantum yield under a large range of excitation wavelengths.[38] In addition, highly luminescent and color-tunable salicylate ILs have been studied by us previously.[39] Terbium(III) was chosen as the emitting ion, because it shows in its compound reliable emission of green light in high color purity. DADMA+ and C2Vim+ are polymerizable cations, which allow for the generation of ionic polymers which can be relevant for device application.[13,44] To verify energy transfer from the salicylate ligand to the terbium center, we have synthesized the isostructural complexes with lanthanum, a RE cation that shows no light emission itself. Ammonium/phosphonium chloride ([Cat]Cl) (1.0 equiv) and sodium salicylate (Na[Sal]) (1.0 equiv) were combined in anhydrous ethanol (5 mL).
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