Charge-transfer excitation of transition-metal-ion luminescence

LaAlO3:Mn4+ as Near-Infrared Emitting Persistent Luminescence Phosphor for Medical Imaging: A Charge Compensation Study

“…The ZPL is surrounded by both anti-Stokes and Stokes phonon side bands. The ZPL here (718 nm, ~13927 cm −1 ) has a larger wavelength than the value of 712 nm (~14045 cm −1 ), measured at 300 K and reported by Van Ipenburg et al [33] but corresponds to the value reported by Li et al [19]. An assignment of the sidebands to the type of vibration was done by Van Ipenburg et al [33] and the anti-Stokes sidebands at 697.5 nm, 704.5 nm and 710.5 nm appear in our sample.…”

“…The ZPL here (718 nm, ~13927 cm −1 ) has a larger wavelength than the value of 712 nm (~14045 cm −1 ), measured at 300 K and reported by Van Ipenburg et al [33] but corresponds to the value reported by Li et al [19]. An assignment of the sidebands to the type of vibration was done by Van Ipenburg et al [33] and the anti-Stokes sidebands at 697.5 nm, 704.5 nm and 710.5 nm appear in our sample. The 2 E g → 4 A 2g transition has a small electron-phonon coupling and the excited ions usually relax non-radiatively to 2 E g followed by the spin-forbidden 2 E g → 4 A 2g transition, thus resulting in narrow-band emission lines.…”

Synthesis and photo-luminescent properties of new red phosphor SrGe4O9:Mn4+

“…For example, in our previous work [9], we have synthesized Na 2 XF 6 : Mn 4+ (X = Si, Ge, Ti) red phosphors by the co-precipitation method, intense white light can observed from the WLED based on these red phosphors. The PL properties of some composite oxides doped with Mn 4+ have been investigated in details [10][11][12][13][14][15]. Such as, L. Wang prepared a series of red phosphors SrAl 12 O 19 :Mn 4+ , M (M = Li + , Na + , K+, Mg 2+ ), which could be demonstrated to be potential candidates for high color rendering WLEDs [14].…”

“…According to the doped host, red phosphors doped with Mn 4+ ions can be divided into two categories: fluoride hosts and composite oxide hosts [6][7][8][9][10][11][12][13][14][15]. Mn 4+ doped fluoride red phosphors exhibit intense red emission with broad band at ~ 460 2 nm, which could be used on white light-emission diodes (WLEDs) [6][7][8][9].…”

Effect of Alkali-Earth Metal Fluorides on Phase and Luminescence of Magnesium Germanate Phosphors

“…[1][2][3][4][5] Recently, this phosphor has attracted considerable attention because it can be applied to high-end liquid crystal display backlight units with a wide color gamut for abundantly expressing a red tone. 6 As this phosphor can efficiently absorb light with wavelengths of ϳ400 or 450 nm, it has also been applied to InGaN-based near-UV or blue light-emitting diodes ͑LEDs͒.…”