| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1504130 | Solid State Sciences | 2015 | 5 Pages |
•The blue and red emitting NCAS:Eu2+, Eu3+, Sm3+ phosphors were designed.•The NCAS:Eu2+, Eu3+, Sm3+ phosphors could have potential application in white LEDs.•The spectra features are helpful to understand the structural feature of NCAS.•The results can provide useful basic data for further work of phosphor study.
Na0.34Ca0.66Al1.66Si2.34O8:Eu2+/Eu3+/Sm3+ (NCAS:Eu2+/Eu3+/Sm3+) phosphors were prepared by solid-state reaction method, and their photoluminescence properties were investigated. The optical bandgap of the NCAS compound was determined to be 4.04 eV experimentally. The excitation spectrum of NCAS:2%Eu2+ shows a broad excitation band from 240 to 410 nm, which could match with the near-ultraviolet LED chip. Upon 365 nm excitation, blue emissions between 375 and 650 nm have been obtained, accompanied with a continuous red-shift for the predominated emission peaks with increasing Eu2+ concentration. Red and red–orange emissions are gained in the Eu3+/Sm3+ activated NCAS phosphors, respectively. And the spectra features reveal the Eu3+ and Sm3+ ions occupy asymmetry sites. The above investigation results indicate the NCAS:Eu2+/Eu3+/Sm3+ phosphors could have promising applications in white LEDs.
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