Novel multicolor-tunable Eu3+/Bi3+ co-doped Y2Zr2O7 transparent ceramics as potential white-light-emitting materials

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

“…The obtained results conrmed that the energy was transferred from Bi 3+ and Bi 2+ ions to 5 D 0 / 7 F J (J=0, 1, 2, 3, and 4) transitions of Eu 3+ and thus color-tuned the VIS emission spectra of Eu 3+ /Eu 2+ ions. [20][21][22][23] Besides, the measurement and calculation of the optical band gap parameters of REIs doped in different host materials have also been performed to determine the optical band gap energy (E g ) value of REIs in the host materials 24 and thereby directing the relevant optical applications such as color display, LED, WLED, and solar energy. Zinc silicate glasses can be used for optical material applications due to their advantages such as high thermal expansion properties, 26 relatively low glass transition temperature (T g ), and the value of DT = T c − T g greater than 100.…”

Novel color tunable LaCaGaO4:Bi3+,Eu3+ phosphors for high color rendering warm white LEDs

“…In general, Bi 3+ ‐doped phosphors have a wide excitation band in the n‐UV region, which is due to the spin‐allowed 1 S 0 → 3 P 1 transition 20 . Due to the sensitivity to the environment when Bi 3+ ion is employed as an activator, various hosts emit different colors, and the emission range from the 3 P 1 → 1 S 0 transition can encompass the whole visible area 21 . The excitation location of Bi 3+ ions is mostly in the n‐UV region, whereas the emission position is in the visible range, successfully avoiding the reabsorption problem 22 .…”

“…20 Due to the sensitivity to the environment when Bi 3+ ion is employed as an activator, various hosts emit different colors, and the emission range from the 3 P 1 → 1 S 0 transition can encompass the whole visible area. 21 The excitation location of Bi 3+ ions is mostly in the n-UV region, whereas the emission position is in the visible range, successfully avoiding the reabsorption problem. 22 However, certain studies show that Bi 3+ -doped phosphors often have low thermal stability.…”

Dy3+‐doped Y2Zr2O7 highly transparent ceramics for ultraviolet excitable warm white light‐emitting applications

“…[17][18][19] In particular, the representative Y 2 Zr 2 O 7 (YZO) ceramics with a relatively lower phonon energy of about 700 cm −1 , which is lower than that of the state-of-the-art YAG transparent matrix (850 cm −1 ), could lead to a high photoluminescence efficiency, making them are exciting potential for photonic applications such as scintillators and optical gain materials. 20,21 Although some original works about lanthanide-doped YZO transparent ceramics have been reported and demonstrated their lightemitting applications, [21][22][23][24][25] there is no warm white emitting converter excited by a UV light device in YZO host have been reported so far.…”