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Synthesis and characterization of novel europium β‐diketonate organic complexes for solid‐state lighting
Author(s) -
Kalyani N. Thejo,
Dhoble S. J.,
Pode R. B.
Publication year - 2012
Publication title -
luminescence
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 45
eISSN - 1522-7243
pISSN - 1522-7235
DOI - 10.1002/bio.2360
Subject(s) - europium , terbium , photoluminescence , chemistry , yttrium , luminescence , oled , crystallography , nuclear chemistry , analytical chemistry (journal) , materials science , organic chemistry , optoelectronics , layer (electronics) , oxide
ABSTRACT Volatile Eu complexes, namely Eu(TTA) 3 Phen, Eu (x) Y (1‐x) (TTA) 3 Phen; Eu (x) Tb (1‐x) (TTA) 3 Phen; Eu, europium; Y, yttrium; Tb, Terbium; TTA, thenoyltrifluoroacetone; and Phen, 1,10 phenanthroline were synthesized by maintaining stichiometric ratio. Various characterization techniques such as X‐ray diffraction (XRD), photoluminescence (PL) and thermo gravimetric analysis/differential thermal analysis (TGA/DTA) were carried out for the synthesized complexes. Diffractograms of all the synthesized complexes showed well‐resolved peaks, which revealed that pure and doped organic Eu 3+ complexes were crystalline in nature. Of all the synthesized complexes, Eu 0.5 Tb 0.5 (TTA) 3 Phen showed maximum peak intensity, while the angle of maximum peak intensity for all complexes was almost the same with slightly different d‐values. A prominent sharp red emission line was observed at 611 nm when excited with light at 370 nm. It was observed that the intensity of red emissions increased for doped europium complexes Eu (x) Y (1‐x) (TTA) 3 Phen and Eu (x) Tb (1‐x) (TTA) 3 Phen, when compared with Eu complexes. Emission intensity increased in the following order: Eu(TTA) 3 Phen > Eu 0.5 Tb 0.5 (TTA) 3 Phen > Eu 0.4 Tb 0.6 (TTA) 3 Phen > Eu 0.5 Y 0.5 (TTA) 3 Phen > Eu 0.4 Y 0.6 (TTA) 3 Phen, proving their potential application in organic light‐emitting diodes (OLEDs). TGA showed that Eu complexes doped in Y 3+ and Tb 3+ have better thermal stability than pure Eu complex. DTA analysis showed that the melting temperature of Eu(TTA) 3 Phen was lower than doped Eu complexes. These measurements infer that all complexes were highly stable and could be used as emissive materials for the fabrication of OLEDs. Copyright © 2012 John Wiley & Sons, Ltd.