Optical spectra of undoped and rare-earth-(=Pr, Nd, Eu, and Er) doped transparent ceramic Y3Al5O12

Abstract

Undoped and rare-earth- (Pr, Nd, Eu, and Er) doped transparent Y3Al5O12 ceramics have been prepared, and their optical spectra have been measured. It is found that absorption coefficient of the undoped ceramic Y3Al5O12 is almost independent of wavelength with 0.258 cm−1, which gives transmittance of the undoped ceramic Y3Al5O12 to be, for example, 95% for a 2-mm height. Peaks in the absorption and emission spectra of Pr:Y3Al5O12 are assigned to the transitions in 4f2 configuration. The transitions from the multiplets with total angular momentum J=0 to multiplets with even J momentum are strong as predicted by Judd–Ofelt theory. The overall and detail structure of the absorption and emission spectra of Nd:Y3Al5O12 is the same as those in a previous publication. However, the absorption coefficient at nonabsorbing wavelengths by Nd3+ is reduced from more than 1.7 to 0.25 cm−1. A simple estimation of the population inversion threshold of the Nd:Y3Al5O12 ceramic reveals that the threshold is still about 25 times larger than that of single-crystal Nd:Y3Al5O12. Peaks in the absorption and emission spectra of Er:Y3Al5O12 ceramic are assigned to the transitions in 4f11 configuration. The transition energies agree well with those reported for single-crystal Er:Y3Al5O12 and the other hosts within 30 cm−1. A Stark splitting scheme for some multiplets has been constructed. Peaks in the emission, absorption, and excitation spectra of Eu:Y3Al5O12 ceramic are assigned to the transitions in 4f6 configuration. The transition energies are in very good agreement with those of single-crystal Eu:Y3Al5O12 within 8 cm−1 for the emission peaks and 3 cm−1 for the absorption and excitation peaks. Spectral characteristics and derivation of a broad peak in the absorption spectrum at around 280 nm are discussed in some detail.

Fluorescent oxide nanoparticles adapted to active tips for near-field optics

“…In particular, rareearth doped nanocrystals which exhibit interesting optical properties in the visible and near-infrared [1,2] are the focus of an increasing number of studies. Their high emission quantum yield [3], small size, photostability, and in the case of YAG:Ce 3+ (YAG matrix doped with cerium atoms in substitution to yttrium ions; YAG= Y 3 Al 5 O 12 ), short transition lifetime due to its fast parity-allowed transition d-f (< 70 ns in bulk [4] and ~ 30 ns for a NP [5]), have made rare-earth doped nanocrystals suitable candidates for a large variety of applications.…”

Structural analysis and vacuum ultraviolet excited luminescence properties of sol–gel derived Y3Al5O12:Eu3+ phosphors

“…The emission spectra obtained for the sol-gel derived YAG:Eu 3+ phosphors are similar in nature to those reported for YAG:Eu 3+ prepared by solid-state reactions [1,2]. The assignment of the various emission peaks to transitions involving 5 D 0 to the stark split sublevels of 7 F J (J = 1, 2, 3 and 4) are also shown in Fig.…”

“…Yttrium aluminum garnet doped with europium ions (Y 3 Al 5 O 12 :Eu 3+ , YAG:Eu 3+ ) is an important phosphor because of its versatile applications in many luminescent and optical devices. The synthesis and luminescence properties of this phosphor prepared via the conventional solid-state route have been reported [1,2]. The results indicate that Eu 3+ ions substitute at Y 3+ sites in the YAG host and produce an intense red emission.…”

A novel polymer-derived method to prepare Eu-doped Si3N4 yellow phosphor

“…2(a)), which is usually caused by the 4f 7 -4f 6 5d 1 transition of Eu 2 þ . In addition, the spikes appeared in a range of 375-500 nm may also correspond to the 4 f-4f transition of Eu 3 þ , which include 5 F 0 -5 L 7 at 375 nm [6], 5 F 0 -5 L 6 at 397 nm, 5 F 1 -5 D 3 at 419 nm, and 5 F 0 -5 D 2 at 467 nm [7]. The response observed near 250-350 nm is often recognized as the charge transfer band (CTB), which might be related to an excitation of an electron from the N/O 2p state to an Eu 3 þ 4f state [8].…”