Luminescence study of Eu³⁺doped Li₆Y(BO₃)₃ phosphor for solid‐state lighting

Abstract

In this study, Li6 Y1-x Eux (BO3 )3 phosphor was successfully synthesized using a modified solid-state diffusion method. The Eu(3+) ion concentration was varied at 0.05, 0.1, 0.2, 0.5 and 1 mol%. The phosphor was characterized for phase purity, morphology, luminescent properties and molecular transmission at room temperature. The XRD pattern suggests a result closely matching the standard JCPDS file (#80-0843). The emission and excitation spectra were followed to discover the luminescence traits. The excitation spectra indicate that the current phosphor can be efficiently excited at 395 nm and at 466 nm (blue light) to give emission at 595 and 614 nm due to the (5) D0 → (7) Fj transition of Eu(3+) ions. Concentration quenching was observed at 0.5 mol% Eu(3+) in the Li6 Y1-x Eux (BO3 )3 host lattice. Strong red emission with CIE chromaticity coordinates of phosphor is x = 0.63 and y = 0.36 achieved with dominant red emission at 614 nm the (5) D0 → (7) F2 electric dipole transition of Eu(3+) ions. The novel Li6 Y1-x Eux (BO3 )3 phosphor may be a suitable red-emitting component for solid-state lighting using double-excited wavelengths, i.e. near-UV at 395 nm and blue light at 466 nm. Copyright © 2015 John Wiley & Sons, Ltd.

Eu3+‐Doped Phosphor‐in‐Glass: A Route toward Tunable Multicolor Materials for Near‐UV High‐Power Warm‐White LEDs

“…By monitoring at 612 nm attributed to 5 D 0 → 7 F 2 transitions of Eu 3+ ions, characteristic peaks from f–f transition of Eu 3+ and the O–Eu charge transfer band are observed in excitation spectra and it can be found that the intensity of the former transition is stronger than the later one, which makes Eu 3+ ‐doped precursor glass frit a potential luminescent material for solid‐state LED lighting . Beyond that, the excitation peaks located at 381 nm ( 7 F 0 → 5 L 7 ), 393 nm ( 7 F 0 → 5 L 6 ), and 465 nm ( 7 F 0 → 5 D 2 ) are greatly catered to the output wavelength of n‐UV or blue‐emitting LED chips and the emission peaks between 580 and 720 nm ( 5 D 0 → 7 F J , J = 0–4) indicate that it would be a good red‐emitting encapsulant for the PiG based WLEDs . Figure B shows the PL emission spectra with different Eu 3+ contents from 0.1 to 6 mol% excited at 393 nm.…”

Structure Determination and Luminescent Property Studies of the Single Crystal Na3Sm(BO3)2

“…There are two strong emissions in the orange-red region coming from positions at 605 nm and 650 nm, corresponding to the 4 G5/2→ 6 H7/2 and 4 G5/2→ 6 H9/2 transitions of Sm 3+ , respectively [22]. Besides, there are two weak emissions centered at 566 nm and 714 nm, which can be assigned to the 4 G5/2→ 6 H5/2 and 4 G5/2→ 6 H11/2 transitions of Sm 3+ , respectively.…”

Luminescence properties of nanocrystalline Mg2P2O7:Eu phosphor

“…Among these narrow peaks the excitation peak at 395 nm is the most intense one which is attributed to 7 F 0 → 5 L 6 transition of Eu 3+ . Other peaks at 318, 363, 383, 418, and 466 nm were assigned to electronic transitions of 7 F 0 → 5 H 6 , 5 H 3 , 5 L 9 , 5 L 7 , and 5 D 3 respectively . This indicates that this particular phosphor can be successfully excited by 395 nm [near ultraviolet (UV)] as well as 466 nm [blue light emitting diodes (LEDs)].…”