A series of hybrid organo-inorganic mononuclear lanthanoid complexes,[n-NBu_(4)]_(3)[LnH(PW_(11)O_(39))(phen)_(2)]·H_(2)O,denoted as LM^(4)-1-Ln(Ln=Dy^(Ⅲ),Tb^(Ⅲ),Eu^(Ⅲ),Nd^(Ⅲ),Er^(Ⅲ),Ho^(Ⅲ) and Gd^(Ⅲ)),wer...A series of hybrid organo-inorganic mononuclear lanthanoid complexes,[n-NBu_(4)]_(3)[LnH(PW_(11)O_(39))(phen)_(2)]·H_(2)O,denoted as LM^(4)-1-Ln(Ln=Dy^(Ⅲ),Tb^(Ⅲ),Eu^(Ⅲ),Nd^(Ⅲ),Er^(Ⅲ),Ho^(Ⅲ) and Gd^(Ⅲ)),were synthesized via hydrothermal synthesis and were structurally characterized by X-ray diffraction.The optical properties of all complexes have been investigated in the solid state.The temperature-dependent emission spectra of LM^(4)-1-Dy,LM^(4)-1-Tb and LM^(4)-1-Eu complexes show intense lanthanoid emissions in the visible region,while LM^(4)-1-Nd shows near-infrared(NIR)luminescence.The Eu^(Ⅲ) complex shows typical strong red emissions from the ^(5)D_(0)→^(7)F_(0,1,2,3,4) transitions,with the CIE colour coordinates(0.631,0.364),the colour purity value of 83.9% and a quantum yield of up to 4.3%,suggesting that the organic fragment has an effect on the optical properties compared to fully inorganic systems,making this complex very attractive as a red component of light-emitting diodes.The luminescence decays of LM^(4)-1-Dy,LM^(4)-1-Tb and LM^(4)-1-Eu exhibit a biexponential behaviour,with τ_(AV)=4.1(7)μs,0.35(2)ms and 0.94(3)ms,respectively.The values obtained for Judd-Ofelt intensity parameters Ω_(2) and Ω_(4) support the interaction between the Eu^(Ⅲ) and the ligands.Furthermore,those with Er^(Ⅲ) and Ho^(Ⅲ) present weak emissions in the visible region.The T-dependent photoluminescence results show that the LM^(4)-1-Dy,LM^(4)-1-Tb and LM^(4)-1-Nd complexes have good temperature sensitivity,demonstrating that the materials have the potential to be used as a sensing element for luminescent thermometers in different temperature ranges.展开更多
基金FONDECYT 11160830 for financial supportthe REDI170277 project for financial support+7 种基金the partial support from Financiamiento Basal AFB180001(CEDENNA)the LIA-M3-1027 CNRS Collaborative Programfunded by the Spanish MICINN(Unidad de Excelencia“María de Maeztu”MDM-2015-0538 and project CTQ2017-89528-P)the Generalitat Valenciana(PROMETEU/2019/066)MICINN for a Ramón y Cajal contractfinanced in part by the Coordenacão de Aperfeicoamento de Pessoal de Nível Superior(CAPES)-Conselho Nacional de Desenvolvimento Científico e Tecnológico(CNPq)Fundacão de Amparoà Pesquisa do Estado de Goiás(FAPEG)Financiadora de Estudos e Projetos(FINEP)Brazilian agencies.
文摘A series of hybrid organo-inorganic mononuclear lanthanoid complexes,[n-NBu_(4)]_(3)[LnH(PW_(11)O_(39))(phen)_(2)]·H_(2)O,denoted as LM^(4)-1-Ln(Ln=Dy^(Ⅲ),Tb^(Ⅲ),Eu^(Ⅲ),Nd^(Ⅲ),Er^(Ⅲ),Ho^(Ⅲ) and Gd^(Ⅲ)),were synthesized via hydrothermal synthesis and were structurally characterized by X-ray diffraction.The optical properties of all complexes have been investigated in the solid state.The temperature-dependent emission spectra of LM^(4)-1-Dy,LM^(4)-1-Tb and LM^(4)-1-Eu complexes show intense lanthanoid emissions in the visible region,while LM^(4)-1-Nd shows near-infrared(NIR)luminescence.The Eu^(Ⅲ) complex shows typical strong red emissions from the ^(5)D_(0)→^(7)F_(0,1,2,3,4) transitions,with the CIE colour coordinates(0.631,0.364),the colour purity value of 83.9% and a quantum yield of up to 4.3%,suggesting that the organic fragment has an effect on the optical properties compared to fully inorganic systems,making this complex very attractive as a red component of light-emitting diodes.The luminescence decays of LM^(4)-1-Dy,LM^(4)-1-Tb and LM^(4)-1-Eu exhibit a biexponential behaviour,with τ_(AV)=4.1(7)μs,0.35(2)ms and 0.94(3)ms,respectively.The values obtained for Judd-Ofelt intensity parameters Ω_(2) and Ω_(4) support the interaction between the Eu^(Ⅲ) and the ligands.Furthermore,those with Er^(Ⅲ) and Ho^(Ⅲ) present weak emissions in the visible region.The T-dependent photoluminescence results show that the LM^(4)-1-Dy,LM^(4)-1-Tb and LM^(4)-1-Nd complexes have good temperature sensitivity,demonstrating that the materials have the potential to be used as a sensing element for luminescent thermometers in different temperature ranges.
