Pengju Li

Synthesis and Luminescence Properties of Eu3+ Doped High Temperature Form of Bi2MoO6

This work reports on the luminescence properties of the Eu3+-doped high-temperature form of Bi2MoO6 by a solid-state reaction technique at high temperature. Various characterization methods including x-ray diffraction, scanning electron microscopic, Fourier transform infrared, and fluorescence spectroscopy measurements were utilized in order to investigate the phase purity and surface morphology as well as photoluminescence properties for as-prepared phosphors. The spectroscopic characteristics including excitation and emission spectrum, concentration quenching phenomenon, decay curves, and chromaticity coordinates are discussed in detail. The nature of the luminescence behavior of Eu3+ was understood in term of the Judd–Ofelt theory, and the luminescent quantum efficiency of 5D0 → 7F2 transition of Eu3+ was estimated. The as-prepared phosphors can be effectively excited with a 465-nm blue light, and exhibit a reddish-orange emission belonging to the prevailing 5D0 → 7F2 transition of Eu3+ with a decay time of milliseconds. This indicates that the Bi2MoO6:Eu3+ phosphors could have potential application in white light-emitting diodes (w-LEDs) based on blue LED chips.

LUMINESCENCE PROPERTIES OF NOVEL SINGLE-HOST WHITE-LIGHT-EMITTING PHOSPHOR KBABP2O8:DY3+

A series of white-light-emitting KBaBP2O8:Dy3+ phosphors were synthesized by using a solid state reaction technique at high-temperature. X-ray diffraction and fluorescence spectroscopy measurements were utilized to characterize the structure and luminescence characteristics including excitation and emission spectra, decay curves, chromaticity coordinates of the assprepared phosphors. The influence of the doping concentration of Dy3+ on the relative emission intensity of Dy3+ was investigated. The critical distance as well as concentration quenching mechanism was calculated and confirmed. The as-prepared phosphors can be effectively excited with near ultraviolet, and exhibit white light emission with short decay time of milliseconds. The above work indicates these phosphors could be potential candidates as single-host white-light-emitting phosphors for application in white light-emitting-diodes.

KBaBP2O8:Tm3+: a novel blue-emitting phosphor with high color purity

A series of novel blue emitting K1 + xBa1 − 2xTmxBP2O8 (0.01 ≤ x ≤ 0.08) phosphors were synthesized by a solid-state reaction at a high temperature for the first time. The phase purity and photoluminescence properties were investigated by X-ray diffraction (XRD) and fluorescence spectroscopy (FS) measurements, respectively. The influence of the doping concentration of Tm3+ on its relative emission intensity was investigated, and the critical distance was calculated. The as-prepared phosphor can be effectively excited with a 356-nm light, and exhibit blue emission at 457 nm with high color purity. The above work indicates this phosphor could be a potential candidate as blue emitting phosphor for application in white light-emitting diodes.

Characterization and photoluminescence properties of sol-gel derived Bi2MoO6:Eu3+ phosphor

This work first reported the characterization and photoluminescence properties of Eu3+ doped Bi2MoO6 phosphor prepared by sol-gel method. The phosphor was characterized by X-ray diffraction, field emission scanning electron microscopic, fourier transform infrared spectrum, and fluorescence spectroscopy measurements in order to investigate the phase purity, surface morphology, and photoluminescence properties. The spectroscopic characteristics including excitation and emission spectrum, decay curve, and chromaticity coordinates were discussed. The as-prepared phosphor can be effectively excited with 345/465 nm light, and exhibit red emission belonging to the prevailing 5D0 → 7F2 transition of Eu3+ with decay time of milliseconds. The above spectral characteristics indicate sol-gel derived Bi2MoO6:Eu3+ phosphor could be regarded as a potential red phosphor for application in white light-emitting diodes (w-LEDs) based on ultraviolet (UV)/blue LED chips.