Luminescence of Ce³⁺ in Y₂SiO₅ Nanocrystals: Role of Crystal Structure and Crystal Size.

Abstract

Luminescence D 6540Luminescence of Ce 3+ in Y 2 SiO 5 Nanocrystals: Role of Crystal Structure and Crystal Size. -Ce doped Y2SiO5 nanoparticles are synthesized for the first time by a sol-emulsion-gel method. The emission at 430 nm and lifetime of the excited state of the samples are sensitive to the crystal structure, crystal size, and dopant concentration. The overall lifetime of 0.5 mol% Ce doped Y2SiO5 nanocrystals are 8.78 and 3.45 ns for 1000 and 1100°C heat-treated samples with the same crystal structure. However, a significant increase in the overall lifetime (35.21 ns) is observed for the 1300°C annealed sample having a different crystal structure. -(SAHA, S.; CHOWDHURY, P. S.; PATRA*, A.; J.

A novel green‐emitting luminescent materials with broad‐band emission for high‐quality warm white LED indoor lighting

“…The asymmetric spectrum can be attributed to the spin‐orbit splitting of the ground state 2 F 5/2 and 2 F 7/2 of Ce 3+ , which can be fitted two peaks by Gaussian Fitting at 501 nm (19 955 cm −1 ) and 554 nm (18 065 cm −1 ). And the energy difference between the two peaks is about 1890 cm −1 , which is close to the theoretical difference value between 2 F 5/2 and 2 F 7/2 about 2000 cm −1 33‐34 . In order to obtain the best concentration of doping, the series of Ce 3+ ‐doped CGHAO samples with different Ce 3+ contents were also investigated, and the concentration‐dependent PL spectra in 3D color projection are given in Figure 5B.…”

Study on the effects of 5d energy locations of Ce^3+ ions on NIR quantum cutting process in Y_2SiO_5: Ce^3+, Yb^3+

“…The lifetimes (τ) of Ce 3+ (1) and Ce 3+ (2) ions are estimated to be about 34.2 ns and 30.7 ns, respectively. The difference in decay behavior may be due to local symmetry of the host lattice [30]. When Yb 3+ ions are codoped, the decay curves of Ce 3+ (1) and Ce 3+ (2) exhibit obvious nonexponential feature (Curves 2 and 4) and the lifetime of Ce 3+ decrease gradually as Fig.…”

NaBaY(BO3)2:Ce3+,Tb3+: A novel sharp green‐emitting phosphor used for WLED and FEDs

“…Among the rest, M1 and M2 are derived from one of the Ce 3+ sites and M3 and M4 belong to another. In a general way, the typical emission of Ce 3+ contains two parts of 5d‐ 2 F 5/2 and 5d‐ 2 F 7/2 with an interval of around 2000 cm −1 in energy . In our case, the energy separation of Ce 3+ 2 F J ( J = 7/2, 5/2) are evaluated to be 1949 cm −1 and 2041 cm −1 for the two Ce 3+ sites, respectively.…”