Luminescence of (Ca, La)S : Dy

Photoluminescence characterization of Dy3+ and Eu2+ ion in M5(PO4)3F (M=Ba, Sr, Ca) phosphors

“…The excitation spectrum monitored at blue emission from Dy 3+ ion indicates several bands. Dy 3+ with 4f 9 configuration has complicated f-block energy levels, therefore various possible transitions between these levels are highly selective, and show sharp line spectra [45]. The excitation spectrum in the range of 250-400 nm is due to f → f transition of Dy 3+ ion having highest intensity peak at 348 nm, which is assigned due to 6 h 15/2 → 6 m 21/2 transition.…”

Preparation and photoluminescence of Dy3+-doped Sr5(PO4)3Cl nanorods

“…Dy 3+ with 4f 9 configuration has complicated f-block energy levels, therefore various possible transitions between these levels are highly selective, and show sharp line spectra [4]. The yellow band (575 nm) corresponds to the hypersensitive transition 4 F 9/2 -6 H 13/2 ( l = 2, J = 2) and the blue band (486 nm) corresponds to the 4 F 9/2 -6 H 15/2 transition.…”

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“…The results indicated that the emission spectra of the phosphors had the same broad band with a maximum intensity at 442 nm that characterized the transition of electronic configuration from 4f 6 5d 1 to 4f 7 of Eu 2+ ion. In addition, the spectra component also has a small peak at a wavelength of 575 nm due to 4 F9/2  6 H13/2 transitions of Dy 3+ ions [3,7] ( fig. 2).…”

“…It was reported that the emission spectra of the phosphors alkaline earth aluminate doped Eu 2+ ion had a broad band that characterized the transition of electronic configuration from 4f 6 5d 1 to 4f 7 of Eu 2+ ion [2][3][4][5]. The photoluminescence of materials have a strong dependence on crystal field [3][4][5].…”