Single crystal growth and property investigation of Dy³⁺ and Tb³⁺ co-doped Gd₃Sc₂Al₃O₁₂ (GSAG): multiple applications for GaN blue LD pumped all-solid-state yellow lasers and UV or blue light chip excited solid-state lighting

Abstract

A high-quality Dy3+ and Tb3+ co-doped GSAG single crystal with crystal size of ϕ25×25 mm3 has been grown successfully with the traditional Czochralski method. The crystal structure and effective segregation...

Dy3+ and Tb3+ codoped mixed garnet crystals with a high-disorder structure for promising efficient InGaN laser-diode pumped yellow lasers

“…This shift signifies a decrease in the lattice constant due to the incorporation of RE ions. 29 These findings are consistent with the results obtained from single-crystal XRD, 23,26 as shown in Fig. 2(e).…”

“…The value of k seg , determined as 0.63 through SEM/EDS analysis (Section 3 in the ESI†), is higher than that in the GSAG host (0.605). 23 This higher value can be attributed to the closer ionic radii of Dy 3+ and Y 3+ compared to Gd 3+ , facilitating the easier incorporation of the Dy 3+ dopant into the GYSAG matrix and resulting in an increased k seg .…”

“…The growth procedure followed a similar approach as described in our previous studies. 23,26 However, in this study, we modified the pulling, cooling rates and thermal-insulation structure to mitigate the crystal cracking caused by internal thermal stress. Since the mixed garnet crystals have large lattice distortions and can easily crack, we reduce the pulling and cooling rates to 0.5–1 mm h −1 and 20–25 K h −1 , respectively.…”

“…To overcome this issue, researchers have reported that codoping of Tb 3+ can facilitate energy resonant transfer between the 6 H 13/2 state of Dy 3+ and the 7 F 4 state of Tb 3+ , effectively addressing the particle blocking effect in the 6 H 13/2 state of Dy 3+ . 22–24…”

Composition-Engineered GSAG Garnet: Single-Crystal Host for Fast Scintillators

“…One of the possible elements that can partially or fully substitute either Al or Ga in the GAGG host is Sc . As for many other garnet hosts, the gadolinium–scandium–aluminum garnet (GSAG) composition was mainly studied for its potential of solid-state laser technology. , To this date, only a few articles have been published focusing on the potential of GSAG as a scintillator. The first brief report on the scintillation parameters of this material was published in 1994 .…”