Blue-White-Yellow Tunable Emission from Ce3+ and Eu2+ Co-Doped BaSiO3 Phosphors

Abstract

Ce 3+ and Eu 2+ co-doped BaSiO 3 phosphors simultaneously emit bluish purple and yellow double-color light under the excitation of 335 nm ultraviolet (UV) light. The asymmetric blue-violet emission originates from Ce 3+ , whereas the yellow emission originates from Eu 2+ . The luminescent spectra reveal that an efficient resonance energy transfer can occur from the Ce 3+ to the Eu 2+ ions. Based on the principle of energy transfer, the varied emitted color of the phosphors from blue-violet through white and finally to yellow can be achieved by properly tuning the ratio of Ce 3+ /Eu 2+ . Results indicate that the present phosphor BaSiO 3 :Ce 3+ , Eu 2+ is one of potential candidates for white light-emitting diodes based on UV light-emitting diodes (LEDs) chip.

Insights into the discrepant luminescence for BaSiO3:Eu2+ phosphors prepared by solid‐state reaction and precipitation reaction methods

“…A symmetrical broad yellow emission band peaked at 570 nm (λ ex = 350 nm) and a full width at half maximum (FWHM) about 125 nm was recorded for the precipitation reaction prepared BaSiO 3 :Eu 2+ phosphor. This result is consistent with observations by Cho et al (emission peak: 565 nm, FWHM: ~115 nm) and Guo et al (emission peak: 570 nm, FWHM: ~120 nm) . The Stokes shift (ΔS), difference in wavelength between the maximum of the excitation spectrum and the maximum of the emission spectrum, was estimated to be 11 020 cm −1 , which is little larger than the value (9850 cm −1 ) calculated by Guo et al For the solid‐state reaction prepared BaSiO 3 :Eu 2+ phosphor, a broad green emission band positioned at 505 nm (λ ex = 350 nm) with a FWHM of 55 nm and an ΔS of 5200 cm −1 was observed.…”

“…This result is consistent with observations by Cho et al (emission peak: 565 nm, FWHM: ~115 nm) and Guo et al (emission peak: 570 nm, FWHM: ~120 nm) . The Stokes shift (ΔS), difference in wavelength between the maximum of the excitation spectrum and the maximum of the emission spectrum, was estimated to be 11 020 cm −1 , which is little larger than the value (9850 cm −1 ) calculated by Guo et al For the solid‐state reaction prepared BaSiO 3 :Eu 2+ phosphor, a broad green emission band positioned at 505 nm (λ ex = 350 nm) with a FWHM of 55 nm and an ΔS of 5200 cm −1 was observed. A similar green emission band at around 505 nm for the BaSiO 3 :Eu 2+ phosphor has been reported in several studies .…”

Vacuum Referred Binding Energy Scheme, Electron–Vibrational Interaction, and Energy Transfer Dynamics in BaMg2Si2O7:Ln (Ce3+, Eu2+) Phosphors

“…Generally, the shape and size (bond length and coordination number) of the first anion coordination polyhedron around Ce 3+ determine the crystal field splitting. 21 Compared with other compounds with 8-fold coordination environment, the crystal field splitting of Ce 3+ in BaMg 2 Si 2 O 7 falls between those of BaSiO 3 (∼14.3 × 10 3 cm −1 ) 22 and Ba 2 MgSi 2 O 7 (∼16.4 × 10 3 cm −1 ). 23 Figure 3a displays the highest-height-normalized emission (λ ex = 276 nm) spectra of BMSO:xCe 3+ (x = 0.005−0.03) at RT.…”

Photoluminescence properties and energy transfer of Eu3+,Bi3+ co-doped Ca9Y(PO4)7 phosphors

“…Fig. 6 illustrates that the emission spectrum of Ca 9 Y 0.99 (PO 4 ) 7 :Bi 3+ 0.01 phosphor and the excitation spectrum of Ca 9 Y 0.6 (PO 4 ) 7 :Eu 3+ 0.4 are not discrete but overlap and interweave, thus indicating a favorable condition for efficient energy transfer from the sensitizer Bi 3+ to the activator Eu 3+ [27]. Fig.…”