Publications

New approach to deposition of thin luminescent films of lanthanide aromatic carboxylates

A new approach to the luminescent thin films deposition of non-volatile and non-soluble lanthanide aromatic carboxylate, based on the formation and decomposition of mixed-ligand complexes, was proposed and exemplified for terbium o-phenoxybenzoate thin film deposition.

Link: http://www.sciencedirect.com/science/article/pii/S1387700311005569

Authors: Utochnikova V. / Kalyakina A. / Kuzmina N.

Magazine: Inorganic Chemistry Communication

Publication year: 2012

Novel terbium luminescent complexes with o-phosphorylated phenolate ligands

Lanthanide complexes with ortho-phosphorylated phenolate ligands LnL3 (Ln = Eu, Tb, Lu; HL1 = 2-di(p-tolyl)phosphorylphenol; HL2 = 2-diphenylphosphoryl-4-ethylphenol) were synthesized for the first time and characterized by elemental analysis, FTIR, 1H, 31P NMR spectroscopy, LDI-TOF mass-spectrometry. The energy gap between the triplet energy level and the corresponding resonance level of a lanthanide ion (5D1 for Eu3+ and 5D4 for Tb3+) is optimal for luminescence sensitization of only terbium ions. Bright green photo- and electroluminescence of terbium complexes was demonstrated.

Link: http://www.sciencedirect.com/science/article/pii/S1387700312000809

Authors: Shuvaev S., Kotova O., Utochnikova V., Vaschenko A., Puntus L., Baulin V., Kuzmina N.,
Tzivadze A.

Magazine: Inorganic Chemistry Communication

Publication year: 2012

Reactive chemical vapor deposition (RCVD) of some non-volatile terbium aromatic carboxylate thin films

In this work we report a new RCVD technique which allows the deposition of nonvolatile compounds from the gas phase into thin films. The technique developed is based on the metathesis reaction in the gas phase between the volatile reagents with the following deposition of the nonvolatile product. A novel RCVD reactor has been constructed and consists of two evaporation (T1, T2) zones connected to the reaction zone (T3). This approach has been successfully tested on terbium carboxylates (Tb(Carb)3; HCarb = Hbz (benzoic acid ), Hpobz (ophenoxybenzoicacid)) as nonvolatile but promising complexes for their application as thin film optical materials. We demonstrated that the construction of the reactor plays a crucial role in the controlling of the films composition, morphology and thickness. The optimal parameters have been found and Tb(Carb)3 thin films with roughness [similar]2–4 nm and thickness in the range of [similar]40–200 nm were obtained.

Link: http://pubs.rsc.org/en/Content/ArticleLanding/2012/JM/c2jm13643k#!

Authors: Kotova Oxana V., Utochnikova V., Samoylenkov Sergey V., Rusin Alexandr D., Lepnev
Leonid S., Kuzmina Natalia P.

Magazine: Journal of Materials Chemistry

Publication year: 2012

Reactive chemical vapor deposition method as new approach for obtaining electroluminescent thin film materials

The new reactive chemical vapor deposition (RCVD) method has been proposed for thin film deposition of luminescent nonvolatile lanthanide aromatic carboxylates. This method is based on metathesis reaction between the vapors of volatile lanthanide dipivaloylmethanate (Ln(dpm)3) and carboxylic acid (HCarb orH2Carb′) and was successfully used in case of HCarb. Advantages of the method were demonstrated on example of terbium benzoate (Tb(bz)3) and o-phenoxybenzoate thin films, and (bz)3 thin films were successfully examined in the OLED with the following structure glass/ITO/PEDOT:PSS/TPD/Tb(bz)3/Ca/Al. Electroluminescence spectra of Tb(bz)3 showed only typical luminescent bands, originated from transitions of the terbium ion. Method peculiarities for deposition of compounds of dibasic acids H2Carb′ are established on example of terbium and europium terephtalates and europium 2,6-naphtalenedicarboxylate.

Link: http://www.hindawi.com/journals/amse/2012/809028/

Authors: Utochnikova Valentina V., Kotova Oxana V., Vaschenko Andrey A., Lepnev Leonid S.,
Kuzmina Natalia P.

Magazine: Advances in Materials Science and Engineering

Publication year: 2012

Thin Films of Tb(pobz)3 (Hpobz = 2-phenoxybenzoic acid): Reactive CVD and Optical

Thin films of aromatic terbium carboxylates are promising materials for application in different optical devices. However, thin films deposition of these compounds by common methods is almost impossible due to their low solubility in most common organic solvents and nonvolatility. In our previous work it was shown that thin films of one of the simplest aromatic terbium carboxylate Tb(bz)3 (Hbz — benzoic acid) can be obtained by the original approach based on the exchange reaction betwee volatile precursors — reactive CVD (RCVD). Herein we improved this approach and demonstrated its possibilities and advantages on deposition of thin films of new emissive material — Tb(pobz)3 (Hpobz — phenoxybenzoic acid). The bulk products and thin films of Tb(pobz)3, obtained by RCVD method were characterized elemental analysis, IR-, Raman and photoluminescent spectroscopy as well as thin films were studied by AFM and SEM techniques.

Organic LEDs based on lanthanide complexes comprise both high monochromaticity and quantum efficiency. Novel electroluminescent material based on tris-(2-diphenylphosphoryl-4- ethylphenolate) terbium (III) possesses high volatility, thermal and UV-stability, which are essential requirements for successful OLED performance. OLED was fabricated by PVD approach and an appropriate structure of transport layers was proposed.

Link: http://sid.elis.ugent.be/proceedings/S1-3.pdf

Authors: Kotova O., Utochnikova V., Samoilenkov S., Kuzmina N.

Magazine: Proceedings to the SID Mid-Europe Chapter Spring Meeting
Publication year: 2013

Novel electroluminescent material based on terbium complex with aromatic o-phosphorylated

Organic LEDs based on lanthanide complexes comprise both high monochromaticity and quantum efficiency. Novel electroluminescent material based on tris-(2-diphenylphosphoryl-4-ethylphenolate) terbium (III) possesses high volatility, thermal and UV-stability, which are essential requirements for successful OLED performance. OLED was fabricated by PVD approach and an appropriate structure of transport layers was proposed.

Link: http://sid.elis.ugent.be/proceedings/S1-3.pdf

Authors: Sergey Shuvaev / Valentina Utochnikova / Andrey Vaschenko / Natalia Kuzmina

Magazine: Proceedings to the SID Mid-Europe Chapter Spring Meeting

Publication year: 2013