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A novel green phosphor for three band white LEDs

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cris.author.scopus-author-id23471432800
cris.author.scopus-author-id12141218300
dc.contributor.authorVaidyanathan, Sivakumar
dc.contributor.authorUpadhyayula, Varadaraju
dc.date.accessioned2023-09-20T05:41:19Z
dc.date.available2023-09-20T05:41:19Z
dc.date.issued01-12-2005
dc.description.abstractCurrent technology of lighting is Solid state lighting using LED's (SSL-LED). The aim of the present study is to find the critical concentration of Eu2+ for high emission intensity and also the role of Ce 3+ co-doping on the absorption and emission properties in the host BaMgSiO4. Photoluminescence emission of Eu2+ in BaMgSiO4 when excited with 370 nm shows a broad band in the region 450 to 550 nm with a maximum at 502 nm and a shoulder at ∼480 nm and one more band at ∼ 400nm. The three emissions are due to Eu2+ in three different Ba sites in the lattice. Studies on Ba1-xEuxMgSiO4 [x = 0.0025 - 0.1 in steps of 0.0025] show that the emission intensity is maximum for x = 0.075 and a decrease in emission intensity is observed for higher x values. Ce3+ luminescence is studied for the first time in BaMgSiO4. Ce3+ emission occurs as a broad band with maximum at 430 nm when excited with 356 nm. The Eu2+ excitation that occurs in the region 250 - 420 nm covers both the Ce3+ absorption and emission. Hence Ce3+ to Eu2+ energy transfer is possible in BaMgSiO4. In the case of Ba0.99-xEu 0.01CexMgSiO4 [x = 0.0025 - 0.1], it is observed that the emission intensity of Eu2+ increases with increasing Ce3+ content up to 0.01. This result proves the energy transfer from Ce3+ to Eu2+. Thus, the co-doping of Ce 3+ also enhances the absorption of Eu2+ in the near UV to blue region where the LED emission occurs. BaMgSiO4:Eu2+, Ce3+ with bright green emission can find potential application as a green phosphor for SSL-LED technology.
dc.identifier.doi10.1117/12.614299
dc.identifier.issn0277786X
dc.identifier.scopus2-s2.0-31844454301
dc.identifier.urihttps://apicris.irins.org/handle/IITM2023/52724
dc.relation.ispartofseriesProceedings of SPIE - The International Society for Optical Engineering
dc.sourceProceedings of SPIE - The International Society for Optical Engineering
dc.subjectGreen phosphor
dc.subjectSilicate
dc.subjectSolid state lighting (SSL)
dc.subjectThree band LED
dc.titleA novel green phosphor for three band white LEDs
dc.typeConference Proceeding
dspace.entity.typePublication
oaire.citation.endPage9
oaire.citation.startPage01-Jan
oaire.citation.volume5941
person.affiliation.cityChennai
person.affiliation.id60025757
person.affiliation.nameIndian Institute of Technology Madras
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