Energy levels and emission parameters of the Dy³⁺ion doped into the YPO₄host lattice

Abstract

Single crystals of Dy(3+)-doped YPO(4) have been grown from Pb(2)P(2)O(7) flux and investigated by optical spectroscopy techniques. The energy level scheme of the active ion has been deduced from the low temperature spectra and reproduced by means of a crystal-field calculation. The room temperature absorption spectra have been analysed in the framework of the Judd-Ofelt approach, and the results of this analysis have been applied in a discussion concerning the spectral composition of the visible luminescence.

Spectroscopic assessment of Dy3+:LiLa(MoO4)2 crystal as an active medium for all-solid-state direct yellow-emitting lasers

“…In the present study, high (Y/B) ratio is desirable. As Faoro et al [12] and Bigotta et al [17] pointed out, the (Y/B) ratio is closely related to the X 2 parameter calculated by the Judd-Ofelt theory. Large X 2 parameter gives rise to relatively high values of the (Y/B) ratio and of the total emission probability from the 4 F 9/2 upper laser level, which is advantageous for yellow laser oscillation around 570 nm.…”

“…As the X 2 parameter correlates strongly with the absorption and radiative properties of a material [12,17,23], the X 2 parameters of the Dy 3+ :LiLa(MoO 4 ) 2 crystal are listed in Table 4 and compared with some other Dy 3+ -doped matrices. The X 2 parameters for the Dy 3+ :LiLa(MoO 4 ) 2 crystal are of the same order of magnitude as those of the isostructural Dy 3+ :CaMoO 4 [18] and Dy 3+ : LiGd(MoO 4 ) 2 crystals [23], and to our knowledge much greater than those of any other crystals previously reported (e.g., fluorides, silicates, borates).…”

“…6 H 13/2 laser channel of Dy 3+ ($570 nm) under Xe-flashlamp pumping at liquid nitrogen temperature for the first time [7]. Commercialization of blue-violet GaN or near UV InGaN laser diodes (LD) provides a remedy for this disadvantage and offers a new approach for optical pumping, thereby motivating a series of systematic investigation on the optical properties of various matrices activated with Dy 3+ in the visible region [8][9][10][11][12][13]. Major advantages with Dy 3+ -based systems include the availability of commercial blue-violet or near UV LD pumping, high quantum efficiency associated with negligible multiphonon relaxation owing to the wide energy gap between the 4 F 9/2 emitting level and the next lower lying 6 F 1/2 level ($7200 cm À1 ), and the four-level laser scheme favorable for low-threshold laser operation (see Fig.…”

Luminescence properties of Ba2NaNb5O15 crystals activated with Sm3+, Eu3+, Tb3+ or Dy3+ ions

“…These are assigned to the transitions from the 4 F 9/2 to the 6 H 15/2 , 6 H 13/2 and 6 H 11/2 states, respectively. The ratio between the yellow and the blue emission as well as the overall luminescence intensity increase with the value of the O 2 (and to a lesser extent O 4 ) Judd-Ofelt parameter [25]. In this case this ratio is 1.6, i.e.…”

Optical spectra of Dy3+-doped GdVO4 and Ca3Sc2Ge3O12 crystals and evaluation of the Ω2/Ω6 ratio as a quality factor for the classification of Dy3+-activated crystalline hosts

“…Nevertheless, they are not sufficient to account for the large difference between experimental and calculated values. Previous papers have already pointed out that the J-O Theory tends to overestimate the values of the lifetimes, showing some inadequacy in this connection [23,27].…”