Circularly Polarized Absorption and Luminescence of Semiconductor Eu-OCN Nanocrystals in the Blue Region of the Electromagnetic Spectrum

Semiconductor nanomaterials with efficient polarized-light control in the blue region of the visible spectrum are promising candidates for modern and future photo-information technology, display devices, and optical sensing applications. New-type semiconductor Eu(OCN)₂ nanocrystals with circularly polarized absorption (CD: circular dichroism) and emission (CPL: circularly polarized luminescence) under an applied magnetic field are demonstrated here for the first time. The effective CD signal at 1.6 T was observed at approximately 440 nm. The dissymmetry factor of CPL under 100 K, g_M-CPL, was estimated to be 0.01. These characteristic circularly polarized absorption and emission phenomena of Eu(OCN)₂ nanocrystals should be caused by combination between the “Faraday A and C terms” of the magnetic moment in the excited state. Polarized-light control using Eu(OCN)₂ nanocrystals in the blue-light region of the electromagnetic spectrum is a large first step into a new world of photo-functional semiconductor nanomaterials.     

New Luminescent Tetranuclear Lanthanide-Based Silsesquioxane Cage-Like Architectures

The synthesis, structure, magnetic, and luminescence properties investigations of four new cage-like lanthanide-based silsesquioxanes (Cat)₂[(PhSiO_1.5)₈(LnO_1.5)₄(O)(NO_2.5)₆(EtOH)₂(MeCN)₂] (where Cat⁺=Et₄N⁺, PPh₄P⁺ and Ln³⁺=Eu³⁺, Tb³⁺ and (Ph₄P)₄[(PhSiO_1.5)₈(TbO_1.5)₄(O)₂(NO_2.5)₈]⋅10MeCN are reported. They present an unusual prism-like topology of cage architectures and lanthanide-characteristic emission, which makes them the first luminescent cage-like lanthanide silsesquioxanes. One of the Tb³⁺-based cages presents a magnetic spin-flip transition.     

ChemInform Abstract: Gd2O3:Eu Phosphor Particles Prepared from the Polymeric Precursors in Spray Pyrolysis.

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.     

ChemInform Abstract: The System Magnesium-Europium. Part 5. (Eu3Mg14)Mgx with 1.7 ≥ x ≥ 1: An Intermetallic Phase with Channel Structure.

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.