Optical transitions, absorption intensities, and intermanifold emission cross sections of Pr3+(4f2) in Ca5(PO4)3F crystal host

Abstract

A spectroscopic Judd–Ofelt investigation has been performed on Pr3+ ions doped in calcium fluorapatite, Ca5(PO4)3F, belonging to the apatite structure family. The standard Judd–Ofelt analysis was applied to the room temperature absorption intensities of Pr3+ transitions to determine the phenomenological intensity parameters: Ω2, Ω4, and Ω6. Values of the intensity parameters were subsequently used to determine the decay rates (emission probabilities), radiative lifetimes, and branching ratios of the principal intermanifold transitions of Pr3+ from the P23, D21, and P03 manifold states to the lower-lying manifolds. In addition, the room temperature fluorescence lifetimes and emission cross sections of the P23→H53, D21→H43, and P03→F23 transitions were measured; these values were compared with those of Nd3+:yttritium–aluminum–garnet and Pr3+:Sr5(PO4)3 (known as S–FAP).

Spectral Properties of Pr3+‐Doped Transparent‐Glass‐Ceramic Containing Ca5(PO4)3F Nanocrystals

“…However, under excitation at 445 nm, the shape of the emission bands for the Pr 3+ :GC is similar to those for the Pr 3+ :PG under excitations at 435 and 445 nm, which indicates that the Pr 3+ ions in the FAP nanocrystals are difficult to be excited at 445 nm. This is mainly caused by the weak absorption of Pr 3+ :FAP crystal at 445 nm . The broad band from 575 to 626 nm is the overlap of 1 D 2 → 3 H 4 and 3 P 0 → 3 H 6 transitions…”

“…Due to lack of complete data of polarized absorption spectra for the Pr 3+ :FAP crystal, the unpolarized absorption spectrum for the crystal in Ref. and the σ‐polarized one in Ref. shown in Fig.…”

“…Pr 3+ ion has rich emission spectral lines in ultraviolet, visible, and infrared regions. Pr 3+ ‐doped fluorapatite crystal Pr 3+ :Ca 5 (PO 4 ) 3 F (Pr 3+ :FAP) has favorable spectral properties as a laser gain medium . As an example, the fluorescence quantum efficiency of the typical upper level for visible laser, P 0 multiplet of Pr 3+ ion, is 98% for Pr 3+ :FAP 1 and higher than the 82% for Pr 3+ :YAG 3 , in the latter blue and orange laser operations have been realized .…”

Preparation and spectral properties of Nd3+-doped transparent glass ceramic containing Ca5(PO4)3F nanocrystals

“…The refractive indices n a and n c for a and c axes of FAP crystals, respectively, which are determined from the Sellmeier equations in Ref. [18], are also listed in Table 1. It can be seen from the table that the refractive indices of Nd 3+ :GC are between those of Nd 3+ :PG and FAP crystals.…”

First principles NMR study of fluorapatite under pressure

“…Fluorapatite (FAp) is one of the most well-characterized members of the apatite family, and in materials science it has found interesting applications as a host for solid state diode lasers when doped with rare-earth elements, such as praseodymium or ytterbium [7]. It can be also used as a phosphor for fluorescent lamps or plasma display panels, exploiting its photoluminescent properties when doped with Sr, or rare-earth elements [8, 9].…”