Mononuclear luminous β‐diketonate Ln(III) complexes with heteroaromatic auxiliary ligands: synthesis and luminescence characteristics

Abstract

A series of lanthanide (samarium and terbium) β‐diketonates with heteroaromatic auxiliary ligands was synthesized. The prepared complexes were characterized through electrochemical, thermal, and spectroscopic analyses. Infrared analysis revealed the binding of the respective metal ion to oxygen and nitrogen atoms of diketone and ancillary ligands. Thermogravimetry/differential thermogravimetry profiles provided thermal information and specified the high thermal stability of the prepared complexes. The complexes exhibited the sharp and structured Ln‐based emission in the visible region upon irradiation in the ultraviolet range. Photophysical analysis demonstrated the green and orange‐red emission due to the respective characteristic transitions of Tb3+ and Sm3+ ions. Photophysical properties affirmed the luminous behaviour of the synthesized complexes. These luminous lanthanide complexes could be used as emitting materials in the design of organic light‐emitting diodes.

Combustion derived single phase Y4Al2O9:Tb3+ nanophosphor: crystal chemistry and optical analysis for solid state lighting applications

“…The color purity of Y 4− x Al 2 O 9 : x Tb 3+ ( x = 1–5 mol%) nanophosphors could be measured by eqn (15). 66,67 Here, ( x d , y d ) and ( x i , y i ) are the dominant and illuminated points separately. The color parameters for the chosen nanophosphors are listed in Table 5.…”

“…The color purity of Y 4−x Al 2 O 9 :xTb 3+ (x = 1-5 mol%) nanophosphors could be measured by eqn (15). 66,67 CP ¼…”

Gadolinium-based Sm3+ activated GdSr2AlO5 nanophosphor: synthesis, crystallographic and opto-electronic analysis for warm wLEDs

“…Typically, lights are regarded as producing warm light when their CCT was lower than 3000 K. The lights were classified as cool light even though their CCT was more than 4000 K. The McCamy empirical formulation (eqn (13)) served as a means of expressing the values of CCT. 60 CCT = −437 n 3 + 3601 n 2 − 6861 n + 5514.31where, n = ( x − x e )/( y − y e ), ( x , y ) are product's chromaticity coordinates and ( x e , y e ) is the epicenter position with x e = 0.332 and y e = 0.186. The variation of CIE-point ( x , y to u ′, v ′) to evaluate CCT values encompasses following calculations (eqn (14)).…”

“…Typically, lights are regarded as producing warm light when their CCT was lower than 3000 K. The lights were classied as cool light even though their CCT was more than 4000 K. The McCamy empirical formulation (eqn ( 13)) served as a means of expressing the values of CCT. 60 CCT = −437n 3 + 3601n 2 − 6861n + 5514.31…”

Synthesis of green emissive terbium(III) complexes for displays: Optical, electrochemical and photoluminescent analysis

“…These changes are due to the paramagnetic behavior of Tb 3+ . [ 42–44 ] The signals of auxiliary ligands shifted upfield in complexes 1 – 4 . A large downfield shift is noticed in NMR signal of methine proton of TTFA.…”