Spectroscopic characteristics of Dy3+ doped Y3Al5O12 transparent ceramics

Abstract

The spectroscopic characteristics of Dy3+ in YAG (Y3Al5O12) transparent ceramics prepared by solid state synthesis were investigated, with special attention to the visible (yellow, blue) emissions that could be pumped directly by the new developed blue–violet or near UV laser diodes. The absorption and emission spectra, recorded at different temperatures from 10 to 300 K, were analyzed and relevant new parameters, improved energy level scheme, temperature effects, intensity parameters based on Judd-Ofelt theory and radiative transition rates, branching ratios, etc., were estimated and the data are compared with previous reports on garnet single crystals. The potential of the Dy3+: YAG transparent ceramics for yellow or blue laser emission is discussed.

Strong visible and near infrared luminescence in undoped YAG single crystals

“…Copyright 2011 Author(s (YAG) are widely used as host materials for transition and rare earth elements for laser, optoelectronic and scintillation applications. [1][2][3][4][5][6][7] They are the most important solid state laser host materials and the most promising scintillation materials. In addition to their technological importance, they possess many interesting optical properties.…”

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

“…2.0 Â 10 À21 cm 2 for the p and r polarizations) [23]. As already noted previously [9][10][11], the 6 H 15/2 ? 6 F 11/2 transition centered at 1300 nm is considered to be hypersensitive, which can be strongly influenced by the surrounding environment around Dy 3+ .…”

“…The low pumping efficiency, which raises the laser threshold and reduces the laser slope efficiency, seems so far be the most probable obstacle to realize efficient yellow output, not only for the title crystal but also for nearly all Dy 3+ -doped materials. Some measures to enhance absorption efficiency have been discussed in detail in a recent paper [9]. Comparatively large crystal length is required to increase the pump absorption.…”

“…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.…”

Enhanced luminescence of Dy3+/Bi3+ co-doped Gd3Al5O12 phosphors by high-efficiency energy transfer

“…Dy 3? doped LnAG luminescent materials were reported by many researchers [4,[9][10][11][12][13][14]. Previous studies showed that the characteristics emission intensity of Dy 3?…”