title: Revelation of the Technological Versatility of the Eu(TTA)3Phen Complex by Demonstrating Energy Harvesting, Ultraviolet Light Detection, Temperature Sensing, and Laser Applications.
abstract: We synthesized the Eu(TTA)3Phen complex and present herein a detailed study of its photophysics. The investigations encompass samples dispersed in poly(vinyl alcohol) and in ethanol in order to explore the versatile applicability of these lanthanide-based materials. Details upon the interaction between Eu, TTA, and the Phen ligands are revealed by Fourier transform infrared and UV-visible absorption, complemented by steady state and temporally resolved emission studies, which provide evidence of an efficient energy transfer from the organic ligands to the central Eu(3+) ion. The material produces efficient emission even under sunlight exposure, a feature pointing toward suitability for luminescent solar concentrators and UV light sensing, which is demonstrated for intensities as low as 200 nW/cm(2). The paper further promotes the complex's capability to be used as luminescence-based temperature sensor demonstrated by the considerable emission intensity changes of ∼4.0% per K in the temperature range of 50-305 K and ∼7% per K in the temeperature range 305-340 K. Finally, increasing the optical excitation causes both spontaneous emission amplification and emission peak narrowing in the Eu(TTA)3Phen complex dispersed in poly(vinyl alcohol) - features indicative of stimulated emission. These findings in conjunction with the fairly large stimulated emission cross-section of 4.29 × 10(-20) cm(2) demonstrate that the Eu(TTA)3Phen complex dispersed in poly(vinyl alcohol) could be a very promising material choice for lanthanide-polymer based laser architectures.
authors.affiliation: Department of Physics, Banaras Hindu University , Varanasi 221005, India.
authors.forename: Praveen Kumar
authors.initials: PK
authors.lastname: Shahi
authors.affiliation: Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México , Cuernavaca, Morelos 62210, Mexico.
authors.forename: Akhilesh Kumar
authors.initials: AK
authors.lastname: Singh
authors.affiliation: Department of Physics, Indian Institute of Technology (Banaras Hindu University) , Varanasi 221005, India.
authors.forename: Sunil Kumar
authors.initials: SK
authors.lastname: Singh
authors.affiliation: Department of Physics, Banaras Hindu University , Varanasi 221005, India.
authors.forename: Shyam Bahadur
authors.initials: SB
authors.lastname: Rai
authors.affiliation: Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México , Cuernavaca, Morelos 62210, Mexico.|Ullrich Photonics LLC , Wayne, Ohio 43466, United States.
authors.forename: Bruno
authors.initials: B
authors.lastname: Ullrich
keywords: Eu(TTA)3Phen; UV light detection; laser material; luminescent solar concentrators; temperature sensor