Investigation on upconversion luminescence in Yb³⁺/Er³⁺‐codoped Gd₂SiO₅ single crystal

Abstract

Yb 3þ /Er 3þ -codoped Gd 2 SiO 5 (Yb,Er:GSO) single crystal was grown by the Czochralski method. The upconversion properties of the crystal under 940 nm excitation were investigated. Intense emission bands centered at 521, 548, and 652 nm corresponding to the transitions 2 H 11/2 ! 4 I 15/2 , 4 S 3/2 ! 4 I 15/2 , and 4 F 9/2 ! 4 I 15/2 of Er 3þ , respectively, were observed at room temperature. The dependence of the intensity of the Er 3þ emission on the pump power and possible upconversion mechanism were discussed and evaluated. [9][10][11][12][13][14][15][16]. As the sensitizer, Yb 3þ ions perform an important role to reduce the lasing threshold and increase the pump efficiency, Er 3þ luminescence efficiency.Gadolinium oxyorthosilicate crystal Gd 2 SiO 5 (GSO) has been actively investigated recently as the excellent laser gain media because of their low symmetry, high quantum efficiency, and superior luminescence properties [17][18][19][20][21]. In this paper, we report the upconversion emissions of Yb,Er:GSO crystal under 940 nm excitation at room temperature and the upconversion mechanism from Yb 3þ to Er 3þ was discussed.

Upconversion Emission in Tm/Er/Yb Co‐Doped Yttria Stabilized Zirconia Single Crystals

“…To further clarify our understanding of the luminescence process in the Tm 3+ /Er 3+ /Yb 3+ ‐doped YSZ crystals, the luminescence spectra of the x = 0.150 mol% sample was investigated at different laser pump powers, as shown in Figure . The upconversion luminescence intensity ($${I_{{\rm{up}}}}$$) is related to the excitation power ( P ) [Equation (3)] [ 35,36 ] $$\begin{equation}{{\rm{I}}_{up}} \propto {{\rm{P}}^n}\end{equation}$$where n is the number of photons needed to generate the excited state.…”

Crystal Growth of the R2SiO5 Compounds (R = Dy, Ho, and Er) by the Floating Zone Method Using a Laser-Diode-Heated Furnace

“…Pure and doped R 2 SiO 5 crystals have been previously grown using the Czochralski [33,[38][39][40][41][42][43][44][45][46][47], flux [19,29,41,[48][49][50], micropulling-down [51,52] techniques. Er 2 SiO 5 crystals were also obtained when attempting to synthesize the intermetallic compound ErFeRe [32].…”

Green Upconversion Luminescence in Er 3+ /Yb 3+ Codoped CaWO 4 Polycrystals

“…In fact, there is a large spectrum overlap between the 2 𝐹 5/2 → 2 𝐹 7/2 of Yb 3+ NIR emission and the 4 𝐼 15/2 → 4 𝐼 11/2 of Er 3+ absorp-tion bands, which results in an efficient nonradiative energy transfer process and in turn efficient upconversion emission. [6] Host materials for Er 3+ ions play an important role in obtaining high-efficient upconversion signals, due to the different crystal fields caused by structure symmetry of the host materials would contribute to different perturbation terms for the Er 3+ and Yb 3+ inner shell transitions. [7,8] In a series of papers, many reseachers have studied the influence of excitedstate re-absorption loss on the green laser emission in transition 2 𝐻 11/2 → 4 𝐼 15/2 and 4 𝑆 3/2 → 4 𝐼 15/2 pumped by various mechanisms.Zhang et al [9] have already successfully reported optical gain and upconversion luminescence in LaF 3 :Er 3+ /Yb 3+ nanoparticledoped organic-inorganic hybrid materials in waveguide amplifier.…”