Investigation of optical properties: Eu with Al codoping in aluminum silicate glasses and glass‐ceramics

Abstract

Eu-doped transparent oxyfluoride aluminosilicate glass was prepared by controlling with Al codoping of melt-quenched glass fabricated under air atmosphere. In the presence of Al input, the photoluminescence emission spectra under 393 nm excitation shows a blue shift by adjusting the ratio of Eu 3+ and Eu 2+ . After heat treatment of glass, the ratio of Eu 3+ and Eu 2+ of luminescence emission were changed by controlling treatment temperature. The PL intensity of Eu 3+ and Eu 2+ ions in the glass-ceramics (GC) was much stronger than in the precursor glass (PG). The possible mechanism responsible for color tuneability of the ratio of Eu 3+ and Eu 2+ doped was discussed. K E Y W O R D SEu 3+ and Eu 2+ , glass-ceramics, heat treatment, NaYF 4 nanocrystals, W-LED quantum efficiency

Europium‐Catalyzed Aerobic Oxidation of Alcohols to Aldehydes/Ketones and Photoluminescence Tracking

“…7 F 2 , respectively. [30] These spectroscopic differences between Eu 2 + and Eu 3 + species are significantly important features to determine the europium's oxidation states in the specific reaction with europium complexes. Indeed, Zhou's group have recently investigated and determined the changes of oxidation states for europium species doped on oxyfluoride aluminosilicate glass using the ratio of Eu 3 + and Eu 2 + of PL emission intensity.…”

“…While the Eu 2 + from EuBr 2 showed dominant absorption band in aqueous media from l abs = 250-350 nm and weak tailed absorption traces 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 within 400 nm which is associated with transitions from the ground state (electron configuration = 4f 7 ) to the lowest excited state (4f 7 5d), [29] the Eu 3 + from both EuBr 3 and Eu(NO 3 ) 3 showed nearly no peaks in the UV-Vis spectra (Figure 1(a)). [30] These spectroscopic differences between Eu 2 + and Eu 3 + species are significantly important features to determine the europium's oxidation states in the specific reaction with europium complexes. Even though all Eu cation species showed intense emission spectra around l em = 455 nm excited at 395 nm, only Eu 3 + species from both EuBr 3 and Eu(NO 3 ) 3 showed two specifically strong emission peaks at l em = 592 nm and 616 nm, which are involved in the electronic transitions of 5 D 2 !…”

“…In particular, the PL spectra for Eu 2 + and Eu 3 + species exhibited the drastic differences each other (Figure 1(b)). [30] To further get insight into the europium's oxidation states in the oxidation reaction, the alternation of PL spectra during the reaction with Eu(NO 3 ) 3 or EuBr 2 were monitored in AcOH/H 2 O (4:1, v/v) solution at 40 8C (Figure 1(c) and 1(d)) because the cyclic voltammetry (CV) graphs did not provide distinguishable differences between Eu 2 + and Eu 3 + species (Figure S1) and also, it was considerably complex to find the changes of the absorption band in near-UV region due to the absorption spectra of the organic species in the reaction and solvents. 7 F 1 and 5 D 2 !…”

Review—Phosphor Plates for High-Power LED Applications: Challenges and Opportunities toward Perfect Lighting

“…43 Zhang et al 44 reported an Eu 2+ -doped silicate SLSAKP GPP, which had a tunable emission band. Gao et al 45 used Al powder to reduce Eu 3+ to Eu 2+ in a SiO 2 -Al 2 O 3 -Na 2 CO 3 -YF 3 -NaF glass matrix. They found that the ratio of Eu 3+ to Eu 2+ could be controlled by using various amounts of Al.…”

Mechanism for broadening and enhancing Nd3+ emission in zinc aluminophosphate laser glass by addition of Bi2O3

“…The commercial Nd 3+ ‐doped phosphate laser glasses such as N31 (SIOM China), LGH‐8 (Hoya Japan) and LG‐770 (Schott America) have been successfully applied in high peak power laser system . Yet, different from the d‐d and p‐p transition of transition and main group metal ions with tunable emission, the luminescence of RE ions originated from f ‐ f transition is relatively insensitive to the surrounding environment . Thus, it is hard to obtain broad NIR emission band from Nd 3+ ‐doped laser glass.…”