Efficient white upconversion luminescence in Yb³⁺/Eu³⁺ doubly-doped transparent glass ceramic

Abstract

Efficient white upconversion (UC) luminescence is obtained in Yb3+/Eu3+ doubly-doped optical glass ceramic (GC) for the first time. KYb3F10 nanocrystals are controllably precipitated from the amorphous networks via the inducing of Yb3+. Yb3+ ions are spontaneously confined within the compact fluoride crystal structures to produce efficient blue UC emissions of Yb3+-Yb3+ pairs. Eu3+ ions are easily incorporated into the KYb3F10 crystal lattices. Owing to the extremely short interionic distance in the crystal structures, intense green UC emissions apart from the red emissions of Eu3+ are observed, which are not obtained by the traditional Yb3+/Eu3+ doubly-doped GCs. As a result, white UC emissions are synthesized based on the three-primary-color principle and the emission intensities of GCs are dramatically enhanced as compared to glass. The designed GCs provide novel optical gain materials for the promising applications in three-dimensional display, solid-state lighting and tunable fiber lasers.

Optical band gaps and spectroscopy properties of Bim+/Eun+/Yb3+ co-doped (m = 0, 2, 3; and n = 2, 3) zinc calcium silicate glasses

“…At the same time, when increasing the Eu 3+ /Eu 2+ concentrations from 0.6 up to 1.0 mol%, UC emission intensity of Eu 3+ peaks at ∼580, 593, 613, 654, and 706 nm was signicantly increased. 41,42 The mechanism of the UC process of Bi m+ /Eu n+ /Yb 3+ co-doped is depicted in Fig. 10.…”

Crystal phase modified blue upconversion on Tm3+/Yb3+:BCZT ceramic phosphor benefits multifunctionality in white-light applications

“…The research on upconversion (UC) fluorescent materials has come a long way in terms of their wide applicability areas, [1][2][3][4][5][6][7] and, in the last 61 years, significant contribution has been made by a wide community of researcher working day and night to explore more from the UC phenomena. Among the different applications of UC materials, a major research has been done on white LEDs [8][9][10][11] due to their potentiality to replace traditional light sources because of their following advantages, less hazardous to the environment, low energy consumption, 10 and longer lifespan. 11 Commonly, UC based white-light are generated in two basic methods (1) combining three independently optimized monochromatic phosphors (red, green and blue) in a proper mixing ratio in the presence of a mercury atmosphere, which was first introduced in 1996 by Downing et al, 12 (2) direct synthesis of a single UC phosphor that converts infrared light into a mixture of RGB.…”

NIR-Driven White Light Diode Formed with UCNP@AIEgen Nanocomposites

“…13,15 Although luminescent quantum dots have been widely studied, the potential toxicity of quantum dots and expensive rare earth-based phosphors limit their application. 16,17 Coating with an active shell layer causes a considerable increase in the luminous intensity of upconversion materials because such layers protect and reinforce the core materials. Sensitizers on the active shell layer such as Yb 3+ can transfer absorbed light energy to the activator of the core materials, thereby substantially increasing the luminous intensity.…”

“…The co-doped fluoride material can be continually excited at a wavelength of 980 nm through cross-relaxation to induce upconversion, leading to the emission of UV and visible light. 16 To achieve white light emission under excitation with NIR light, we prepared LiYF 4 :Yb 3+ /Tm 3+ @LiYF 4 :Yb 3+ to replace blue light InGaN chips, which emit strong blue and UV light with a wavelength of 980 nm. By mixing colors, 17 polymerizable green light [9,10-bis(piperidinyl-1-propenyl bromide)anthracene (9,10-BPPA)] and red light (1,4-BPPA) aggregation-induced emission (AIE) molecules were dispersed in the reactive acrylic oligomer matrix to perform photopolymerization and obtain a cross-linked composite UCNP film with a thickness of approximately 1 mm.…”

“…LiYF 4 was used as a host material in the UCNPs, and Yb 3+ and Tm 3+ were used as a sensitizer and an activator, respectively. The co-doped fluoride material can be continually excited at a wavelength of 980 nm through cross-relaxation to induce upconversion, leading to the emission of UV and visible light …”