Synthesis, structure, and peculiar green emission of NaBaBO3:Ce3+ phosphors

• Published in: Dalton transactions : an international journal of inorganic chemistry 2014-07, Vol.43 (28), p.1969-1976
• Main Authors: Yu, Ruijin, Zhong, Shengliang, Xue, Na, Li, Hongjuan, Ma, Hailong
• Format: Article
• Language: English
• ISSN: 1477-9226; 1477-9234
• DOI: 10.1039/c4dt00859f

Polycrystalline samples of Ce 3+ -doped NaBaBO 3 (0.5-15 mol%) were prepared by the solid-phase synthesis. The phase formation was confirmed by X-ray powder diffraction (XRD) measurements and structural refinement. The photoluminescence excitation and emission spectra and decay curves were measured. The absolute luminescence quantum efficiency (QE) and the activation energy (Δ E ) were reported. Under the excitation of near-UV light, Ce 3+ -doped NaBaBO 3 presents a green-emission band centred at 505 nm from the allowed inter-configurational 4f-5d transition. The maximum absolute QE of NaBaBO 3 :Ce 3+ was measured to be 58% excited with 395 nm light at 300 K. The thermal stability of the green luminescence was evaluated by the luminescence decays as a function of temperature. The phosphor shows an excellent thermal stability on temperature quenching effects. Compared with the reported Ce 3+ -doped alkali metal and alkaline earth orthoborates with the general formula MNBO 3 with only blue luminescence, the peculiarity of NaBaBO 3 :Ce 3+ is the green emission and a high doping concentration in the lattices. The results were discussed on the relationship between the structure and the luminescence properties. Polycrystalline samples of Ce 3+ -doped NaBaBO 3 (0.5-15 mol%) were prepared by the solid-phase synthesis.