Circularly
polarized luminescence (CPL) is characterized by the differential
emission of right and left circularly polarized light by a chiral
molecule. This mini-review describes the recent developments in chiral
trivalent europium (Eu(III)) complexes with effective CPL. CPL has
many potential applications in security tags, lasers, and three-dimensional
organic electroluminescence devices, which is one of the most intensely
investigated topics in molecular luminophores. Eu(III) complexes have
attracted considerable attention as effective CPL luminophores for
the above-mentioned applications. In this review, recent studies on
the Eu(III) CPL, including the steric (dimer, tetramer, aggregates,
and coordination polymers) and electronic control (mononuclear) of
Eu(III) complexes for the construction of a luminophore with effective
CPL, are discussed. The characteristic CPL applications employing
the chiral mononuclear Eu(III) complexes are also described. Chiral
Eu(III) complexes with well-designed organic ligands can result in
the establishment of new research areas in the fields of photochemistry
and materials science.
The structural and electronic strain of ligands promotes the enhancement of the magnitude of circularly polarized luminescence in chiral Eu(iii) complexes.
This paper reports chiral mixed Eu(iii)–Ln(iii) coordination polymers (Ln = Gd and Sm) for the enhancement of the emission quantum yield (Φtot ≥ 50%), achieved via control of 4f electronic structures.
In this review, we summarize the research progress on π-conjugated Eu(iii) luminophores exhibiting bright emission and their physical sensing applications.
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