abstract
In order to prepare efficient luminescent organic-inorganic hybrid materials embedded with a lanthanide (Ln(3+)) complex with polycarboxylate ligands, Ln(3+)-doped di-ureasils with 4,4-oxybis(benzoic acid) and 1,10-phenanthroline ligands were synthesized via an in-situ sol-gel route. The resulting hybrids were structurally, thermally, and optically characterized. The energy levels of the ligands and the host-to-ion and ligand-to-ion energy transfer mechanisms were investigated (including DFT/TD-DFT calculations). The results show that these Ln(3+)-based di-ureasil hybrids exhibit promising luminescent features, e.g., Eu3+-based materials are bright red emitters displaying quantum yields up to 0.50 +/- 0.05. The luminescent color can be fine-tuned either by selection of adequate Ln(3+) ions or by variation of the excitation wavelength. Accordingly, white light emission with CIE coordinates of (0.33, 0.35) under 310 nm irradiation was obtained.
keywords
ORGANIC-INORGANIC HYBRIDS; CARBOXYLIC-ACID SOLVOLYSIS; LIGHT-EMISSION; COORDINATION POLYMERS; MODIFIED SILICATES; QUANTUM YIELDS; IONS; 1,10-PHENANTHROLINE; PHOTOLUMINESCENCE; NANOHYBRIDS
subject category
Polymer Science
authors
Fang, M; Fu, LS; Correia, SFH; Ferreira, RAS; Carlos, LD
our authors
Lianshe Fu
Assistant Researcher
Luís Carlos
Full professor
Maria Rute de Amorim e Sá Ferreira André
Full professor
Ming Fang
PhD Student
Sandra Filipa Henriques Correia
Researcheracknowledgements
This work was developed within the scope of the project CICECO-Aveiro Institute of Materials, POCI-01-0145-FEDER-007679 (FCT Ref. UID/CTM/50011/2013), financed by national funds through the FCT/MEC and when appropriate co-financed by FEDER under the PT2020 Partnership Agreement. This work was also supported by the China Scholarship Council, grant: 201707920002 (2017-2020).