Influence of Cr³⁺ on yellowish‐green UC emission and energy transfer of Er³⁺/Cr³⁺/Yb³⁺ tri‐doped zinc silicate glasses

Abstract

In this paper, we study the influence of Cr3+ on yellowish‐green upconversion (UC) emission and the energy transfer (ET) of Er3+/Cr3+/Yb3+ tri‐doped in SiO2–ZnO–Na2O–La2O3 (SZNL) zinc silicate glasses under excitation of the 980 nm laser diode (LD). The influence of Cr3+ on enhancing the red UC emission of Er3+/Cr3+/Yb3+ tri‐doped in SiO2–ZnO–Na2O–La2O3 zinc silicate glasses under the excitation of 980nm LD was also investigated. The ET processes between Yb3+, Cr3+, and Er3+, together with the combination of Yb3+‐Cr3+‐Er3+, which led to the green UC emission intensity of Er3+/Cr3+/Yb3+ tri‐doped in SiO2–ZnO–Na2O–La2O3 zinc silicate glasses bands centered at ~546 nm have been significantly enhanced. By increasing the concentration of Cr3+ from 0 up to 5 mol.%, we can locate the Commission Internationale de l'éclairage (CIE) 1931 (x; y) chromaticity coordinates for UC emissions of Er3+/Cr3+/Yb3+ tri‐doped in the central position of the yellowish‐green color region of CIE 1931 chromaticity diagram. Besides, the ET processes between the Yb3+, Cr3+, and Er3+ are also proposed and discussed.

Influences of copper–potassium ion exchange process on the optical bandgaps and spectroscopic properties of Cr3+/Yb3+ co-doped in lanthanum aluminosilicate glasses

“…17,45,[54][55][56] With the increase in salt concentration ratio p from 0.18 to 0.54, the emission intensities of these bands markedly increased. These increments were assigned to the aforementioned ET 1 process (for the band centered at 537 nm) and to the ET 3 process from 2 B 2g / 2 B 1g transition of Cu 2+ to 2 E / 4 A 2g transition of Cr 3+ (for the one at 853 nm), 5,46 which is proposed as follows:…”

“…In recent years, the spectroscopy and optical properties of chromium single-doped and chromium/rare-earth (RE) codoped have been extensively studied [1][2][3][4][5] due to their advantages. 6,7 Chromium is a transition metal (TM) with many different valence states.…”

“…[8][9][10] In the glass networks, it oen exists in the trivalent state Cr 3+ , [1][2][3][4][5]8 which can emit radiation in the visible (VIS), near-infrared (NIR) regions under different excitation wavelengths. 5,11,12 Also, the 4 T 1g (F) / 4 A 2g , 4 T 2g (F) / 4 A 2g , 2 T 1g / 4 A 2g , 2 T 2g / 4 A 2g and 2 E / 4 A 2g transitions of Cr 3+ can be combined with Yb 3+ to generate the VIS, NIR emission spectra. 5,13,14 In 2001, H. U. Güdel et al 15 conrmed that Cr 3+ , in association with Yb 3+ , creates VIS emission in the wavelength range from 400 to 700 nm.…”

“…5,11,12 Also, the 4 T 1g (F) / 4 A 2g , 4 T 2g (F) / 4 A 2g , 2 T 1g / 4 A 2g , 2 T 2g / 4 A 2g and 2 E / 4 A 2g transitions of Cr 3+ can be combined with Yb 3+ to generate the VIS, NIR emission spectra. 5,13,14 In 2001, H. U. Güdel et al 15 conrmed that Cr 3+ , in association with Yb 3+ , creates VIS emission in the wavelength range from 400 to 700 nm. 16 Moreover, our recent study 17 showed that the Cr 3+ /Yb 3+ co-doped in the glasses generates emission spectra in the wavelength regions of 420-700 nm, 660-860 nm, and 970-1150 nm corresponding to the excitations 358, 488, and 690 nm LD.…”

Tm3+/Cr3+ Codoped Dual‐Phase Transparent Glass‐Ceramics for Light Conversion in Photosynthesis

“…The RE ions (Tm 3+ ) and TM ions (Cr 3+ ) are selected to convert the ultraviolet and green light into the blue and red emission region for photosynthesis. [ 20,21 ] Due to the similar thermodynamic crystal barriers, the NaYF 4 and NaAlSiO 4 crystals can be precipitated at an appropriate heat treatment temperature. With different ion radius, Tm 3+ ions and Cr 3+ ions in the dual‐phase GC will enter into the NaYF 4 and NaAlSiO 4 crystals, respectively, during the in situ crystallization.…”