Optical properties of Ba2SiO4:Eu2+ phosphor for green light-emitting diode (LED)

Zhang, Mei; Wang, Jing; Zhang, Liqun; Ding, Weijia; Su, Qiang

doi:10.1016/j.materresbull.2006.05.011

Cited by 155 publications

(39 citation statements)

References 13 publications

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“…The PLE spectrum contains two broad bands at 250-420 nm and 420-550 nm, which can be attributed to 4 Figure 4 that the emission intensity of Mn 4+ ion at 710 nm initially increase, then reaches a maximum at x = 0.005 and decrease due to concentration quenching. It is interesting that the chromaticity coordinates of CYA: Mn…”

Section: Resultsmentioning

confidence: 91%

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A high color purity red emitting phosphor CaYAlO4:Mn4+ for LEDs

Chen

Wang

et al. 2014

J Sol State Light

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An intense red phosphor, CaYAlO 4 :Mn 4+ , was developed by solid state reaction. The photoluminescence excitation and emission spectra, concentration effect, thermal-dependent luminescence quenching properties and decay curves are investigated. The results show Mn 4+ ion exhibits a broadband excitation extending from 250 to 550 nm and emits an intense red light at 710 nm with high color purity and stable chromaticity coordinates. These results demonstrate that Mn 4+ ion can play a role of activator in narrow red emitting phosphor potentially useful in UV (~370 nm) GaN-base or Blue (~460 nm) InGaN-base LED.

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Section: Resultsmentioning

confidence: 91%

“…Recently, the commonly commercial white LED is based on the combination of blue InGaN chip and yellow YAG: Ce 3+ phosphor. However, such white LEDs encounter low color-rendering index (Ra < 80) due to the scarcity of red emission [4][5][6]. Red emitting phosphor is one of key tricolor luminescent materials for white LEDs.…”

Section: Introductionmentioning

confidence: 99%

A high color purity red emitting phosphor CaYAlO4:Mn4+ for LEDs

Chen

Wang

et al. 2014

J Sol State Light

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“…It indicates that the phosphor is suitable for a color converter using n-UV light as the excitation light source used in white LEDs. In the excitation spectrum, the excitation spectrum consists of two broad bands around 273 and 360 nm, respectively, which are mainly ascribed to the transitions of Eu 2+ from the 4f-ground state to the 5d-excited state [17], and the first band may also be partly contributed by the host absorption. The phosphors used for n-UV conversion LEDs must have a strong and broad absorption at 350-400 nm and emit intense desired light, so the emission spectrum under 360 nm excitated is detected.…”

Section: Methodsmentioning

confidence: 99%

A novel blue emitting phosphor NaBa0.98Eu0.02PO4 and the improvement of its luminescence properties

Yue

Yin

et al. 2009

Front. Mater. Sci. China

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A novel blue-emitting phosphor NaBa 0.98 Eu 0.02 PO 4 was synthesized by conventional solid state reaction, and it exhibits efficient blue emission under near-ultraviolet (n-UV) excitation. The emission spectrum shows a single band centered at about 440 nm, which corresponds to the 4f 6 5d 1 -4f 7 transition of Eu 2+ . The excitation spectrum is a broad band in the wavelength range between 200 and 450 nm, which can match the emission of white light emitting diodes (LEDs) by the method of n-UV conversion. The Ca 2+ , Sr 2+ and Mg 2+ were co-doped into NaBa 0.98 Eu 0.02 PO 4 respectively. Special attention was paid to the sample co-doped with Ca 2+ that could possess a higher luminous efficacy than the analogs co-doped with Sr 2+ and Mg 2+ . With the co-doping of Ca 2+ , the enhanced intensity of the excitation and emission band appears. The optimum co-doping concentration of Ca 2+ is 7 mol.%. The emission intensity of NaBa 0.91 Ca 0.07 Eu 0.02 PO 4 phosphoris about 1.68 times than that of NaBa 0.98 Eu 0.02 PO 4 phosphor. The as-prepared phosphors are the potential blue phosphors for application in white LEDs.

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“…For instance, investigations of the optical properties of Eu 2+ -activated Ba 2 SiO 4 have been reported by several authors, which highlighted its applications in solid-state lighting, especially for the production of Hg-discharge lamps and LEDs [1,2,3,4,5]. However, the phosphors reported within these works consist of micrometer-sized crystals.…”

Section: Introductionmentioning

confidence: 99%

Red, Green, and Blue Photoluminescence of Ba2SiO4:M (M = Eu3+, Eu2+, Sr2+) Nanophosphors

et al. 2013

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Divalent europium doped barium orthosilicate is a very important phosphor for the production of light emitting diodes (LEDs), generally associated to the green emission color of micron-sized crystals synthesized by means of solid-state reactions. This work presents the combustion synthesis as an energy and time-saving preparation method for very small nano-sized Ba2SiO4 particles, flexibly doped to acquire different emission energies. The size of the resulting spherical nanoparticles (NPs) of the green emitting Ba2SiO4:Eu2+ was estimated to about 35 nm applying the Scherrer equation and further characterized with aid of atomic force microscopy (AFM) as well as scanning electron microscopy (SEM). This phosphor is able to build homogeneous luminescent suspensions and was successfully down-sized without changing the optical properties in comparison to the bulk phosphors. Besides the X-ray diffraction (XRD) analysis and the different types of microscopy, the samples were characterized by luminescence spectroscopy. Undoped Ba2SiO4 NPs are not luminescent, but show characteristic red emission of the 5D0 → 7FJ (J = 0–4) electronic transitions when doped with Eu3+ ions. Moreover, these orthosilicate nanoparticles generate blue light at low temperatures due to impurity-trapped excitons, introduced by the partial substitution of the Ba2+ with Sr2+ ions in the Ba2SiO4 lattice causing a substantial distortion. A model for the temperature behavior of the defect luminescence as well as for their nature is provided, based on temperature-dependent luminescence spectra and lifetime measurements.

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Optical properties of Ba2SiO4:Eu2+ phosphor for green light-emitting diode (LED)

Cited by 155 publications

References 13 publications

A high color purity red emitting phosphor CaYAlO4:Mn4+ for LEDs

A high color purity red emitting phosphor CaYAlO4:Mn4+ for LEDs

A novel blue emitting phosphor NaBa0.98Eu0.02PO4 and the improvement of its luminescence properties

Red, Green, and Blue Photoluminescence of Ba2SiO4:M (M = Eu3+, Eu2+, Sr2+) Nanophosphors

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