Lanthanide-based luminescent hybrid materials.

Light-Emitting Diodes. (Monographs in Electrical and Electronic Engineering.) By A. A. Bergh and P. J. Dean. Pp. viii+591. (Clarendon: Oxford; Oxford University: London, 1976.) £22.

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Light-emitting diodes

Progress in discovery and structural design of color conversion phosphors for LEDs

Recalling the pertinent provisions of the relevant international environmental conventions, especially the Rotterdam Convention on the Prior Informed Consent Procedure for Certain Hazardous Chemicals and Pesticides in International Trade, and the Basel Convention on the Control of Transboundary Movements of Hazardous Wastes and their Disposal including the regional agreements developed within the framework of its Article 11,

Stockholm Convention on persistent organic pollutants

Bioactive Benzofuran derivatives: A review

Dysprosium doped ZnO–B2O3–P2O5 (ZBP) glasses were prepared by a conventional melt quenching technique in order to study the luminescent properties and their utility for white light emitting diodes (LEDs). X-ray diffraction spectra revealed the amorphous nature of the glass sample. The present glasses were characterized by infrared and Raman spectra to evaluate the vibrational features of the samples. The emission and excitation spectra were reported for the ZBP glasses. Strong blue (484 nm) and yellow (574 nm) emission bands were observed upon various excitations. These two emissions correspond to the F49/2→H615/2 and F49/2→H613/2 transitions of Dy3+ ions, respectively. Combination of these blue and yellow bands gives white light to the naked eye. First time, it was found that ZnO–B2O3–P2O5 glasses efficiently emit white light under 400 and 454 nm excitations, which are nearly match with the emissions of commercial GaN blue LEDs and InGaN LED, respectively. CIE chromaticity coordinates also calculated for...

White light generation from Dy3+-doped ZnO–B2O3–P2O5 glasses

Red light emitting BaNb2O6:Eu3+ phosphor for solid state lighting applications

Lu6WO12 and Lu6MoO12 doped with Eu3+ ions have been prepared by using a citrate complexation route, followed by calcination at different temperatures. The morphology, structure, and optical and photoluminescence properties of the compounds were studied as a function of calcination temperature. Both compositions undergo transitions from a cubic to a hexagonal phase when the calcination temperature increases. All the compositions have strong absorption of near-UV light and show intense red luminescence under a near-UV excitation, which is related to the transfer of energy from the host lattices to dopant Eu3+ ions. Density functional theory calculations have also been performed. The calculation reveals that hexagonal Lu6WO12 and Lu6MoO12 are indirect bandgap materials, and the near-UV excitations are due to the electronic transitions from the O-2p orbitals to W-5d and Mo-4d orbitals, respectively. The lattice parameters and bandgap energies of hexagonal Lu6WO12 and Lu6MoO12 were determined.

Crystal structure, electronic structure, and optical and photoluminescence properties of Eu(III) ion-doped Lu6Mo(W)O12.

Different photoluminescent properties of binary and ternary europium chelates doped in PMMA

Abstract The photoluminescent properties of un-doped and Sm 3+ doped Ca 3 Y 2 Si 3 O 12 phosphors were prepared by the citrate sol-gel method. Un-doped sample has shown a strong blue emission, which has its maximum intensity at 389 nm. Among all the observed emission transitions 4 G 5/2 → 6 H J (J = 5/2, 7/2 & 9/2) of Sm 3+ , the reddish-orange (RO) emission transition 4 G 5/2 → 6 H 7/2 is more prominent, which matches well with the emission wavelength of near UV (n-UV) LED. The reasons for the observance of such prominent visible color emissions from these phosphors have been substantiated appropriately. Besides, structural details of these samples have also been analyzed from the measured XRD, TEM, TG-DTA and FT-IR profiles.

http://ma.ecsdl.org/content/MA2010-02/41/2316.full.pdf

Kiwan Jang

Papers

White light generation from Dy3+-doped ZnO–B2O3–P2O5 glasses

Red light emitting BaNb2O6:Eu3+ phosphor for solid state lighting applications

Crystal structure, electronic structure, and optical and photoluminescence properties of Eu(III) ion-doped Lu6Mo(W)O12.

Different photoluminescent properties of binary and ternary europium chelates doped in PMMA

Citric Sol-Gel Synthesis and Photoluminescence Properties of Un-Doped and Sm3+ Doped Ca3Y2Si3O12 Phosphors