Syntheses, structures and luminescent properties of Sm (III) and Eu (III) chelates for organic electroluminescent device applications

Highly Improved Electroluminescence from a Series of Novel EuIII Complexes with Functional Single‐Coordinate Phosphine Oxide Ligands: Tuning the Intramolecular Energy Transfer, Morphology, and Carrier Injection Ability of the Complexes

“…However, when using TPPO in Eu III complexes, their EL performance, such as brightness and efficiency of the corresponding OLED devices, was very limited. [19] The most important factor is that the first singlet excited energy level (S 1 ) of TPPO is much higher than that of anionic ligands, such as 2-thenoyltrifluoroacetonate (TTA). The energy gap of about 1.5 eV between them is too large to decrease the energy-transfer efficiency from TPPO to TTA.…”

Luminescence enhancement of the Tb(III) ion with the thenoyltrifluoroacetonate ligand acting as an efficient sensitizer

“…There are no significant structural differences between the [Ln(TTA) 2 (NO 3 )(TPPO) 2 ] complexes containing Sm(III), Eu(III) and Tb(III) ions owing to the closeness of their ionic radii of 1.079, 1.066 and 1.040 , respectively[18,20]. The shortest Tb-O distance(Fig.…”

“…In fact, X-rays of the structures of these lanthanide, coordination compounds have shown that the β-diketonate ligands coordinate in an analogous mode. The differences between the Ln(III)-O(β-diketonate) distances for these two complexes are around 0.02 Å [18,19]. Consequently, significant changes in the electronic charge distributions between the tris and tetrakis chelate rings are not expected to take place.…”

Optical Properties of Terbium (III) Complex with Benzoylacetanilide Ligand

“…These complexes have sharp as well as narrow emission, large Stoke's shifts, and long lifetime. These properties make them applicable for light emitting devices [1], electroluminescent materials [2], laser materials [3], luminescence probe [4], sensory materials [5] and full color light emitting display devices [6]. Out of three primary colors i.e red, blue and green, which is basic requirement for mechanized application of rare earth complexes, the terbium(III) ion metal complexes provide green color.…”