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Article: Luminescence Characteristics and Vibronic Coupling Behavior of a Highly Efficient Eu2+-Activated RbLi7Si2O8 Green Phosphor for Wide Color Gamut WLEDs

TitleLuminescence Characteristics and Vibronic Coupling Behavior of a Highly Efficient Eu2+-Activated RbLi7Si2O8 Green Phosphor for Wide Color Gamut WLEDs
Authors
KeywordsRbLi7Si2O8:Eu2+
green phosphors
high efficiency
vibronic coupling
pc-WLEDs
Issue Date2020
PublisherAmerican Chemical Society. The Journal's web site is located at https://pubs.acs.org/journal/aaembp
Citation
ACS Applied Electronic Materials , 2020, v. 2 n. 11, p. 3749-3755 How to Cite?
AbstractHunting for a type of green phosphor with outstanding properties is of much significance for improving the performance of display backlights. In this work, a series of efficient Eu2+-activated RbLi7Si2O8 (denoted as RLSO:Eu2+) green phosphors with different doping concentrations were prepared via a low-temperature solid-state reaction approach under a reduced atmosphere. Photoluminescence (PL) measurements show that the prepared green phosphor with 8 atom % doping concentration of Eu exhibits the best internal quantum yield (IQY) of 95.8%. Besides, the phosphor delivers a good anti-thermal quenching behavior at temperatures <200 K, that is, there is no significant drop in luminescence intensity. Such thermal behavior is well consistent with the temperature dependence of measured luminescence lifetimes. The spectral analysis of the low-temperature luminescence spectrum with a semiclassical time-dependent approach reveals that three electronic levels of the Eu2+ ion coupled with a common low-frequency vibrational phonon mode with an energy of 21 meV shall be responsible for the high-efficiency luminescence of the prepared phosphor. Using the as-prepared green phosphor and K2SiF6:Mn4+ red phosphor, a white light-emitting diode (LED) device with high luminous efficacy (111.08 lm/W) and wide color gamut (112% NTSC) is fabricated on an InGaN blue chip.
Persistent Identifierhttp://hdl.handle.net/10722/295861
ISSN
2021 Impact Factor: 4.494
2020 SCImago Journal Rankings: 1.379
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorTang, F-
dc.contributor.authorLi, H-
dc.contributor.authorTian, K-
dc.contributor.authorXu, S-
dc.contributor.authorWang, X-
dc.contributor.authorXie, C-
dc.contributor.authorYe, H-
dc.contributor.authorCao, Y-
dc.date.accessioned2021-02-08T08:15:04Z-
dc.date.available2021-02-08T08:15:04Z-
dc.date.issued2020-
dc.identifier.citationACS Applied Electronic Materials , 2020, v. 2 n. 11, p. 3749-3755-
dc.identifier.issn2637-6113-
dc.identifier.urihttp://hdl.handle.net/10722/295861-
dc.description.abstractHunting for a type of green phosphor with outstanding properties is of much significance for improving the performance of display backlights. In this work, a series of efficient Eu2+-activated RbLi7Si2O8 (denoted as RLSO:Eu2+) green phosphors with different doping concentrations were prepared via a low-temperature solid-state reaction approach under a reduced atmosphere. Photoluminescence (PL) measurements show that the prepared green phosphor with 8 atom % doping concentration of Eu exhibits the best internal quantum yield (IQY) of 95.8%. Besides, the phosphor delivers a good anti-thermal quenching behavior at temperatures <200 K, that is, there is no significant drop in luminescence intensity. Such thermal behavior is well consistent with the temperature dependence of measured luminescence lifetimes. The spectral analysis of the low-temperature luminescence spectrum with a semiclassical time-dependent approach reveals that three electronic levels of the Eu2+ ion coupled with a common low-frequency vibrational phonon mode with an energy of 21 meV shall be responsible for the high-efficiency luminescence of the prepared phosphor. Using the as-prepared green phosphor and K2SiF6:Mn4+ red phosphor, a white light-emitting diode (LED) device with high luminous efficacy (111.08 lm/W) and wide color gamut (112% NTSC) is fabricated on an InGaN blue chip.-
dc.languageeng-
dc.publisherAmerican Chemical Society. The Journal's web site is located at https://pubs.acs.org/journal/aaembp-
dc.relation.ispartofACS Applied Electronic Materials-
dc.rightsThis document is the Accepted Manuscript version of a Published Work that appeared in final form in [JournalTitle], copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see [insert ACS Articles on Request author-directed link to Published Work, see http://pubs.acs.org/page/policy/articlesonrequest/index.html].-
dc.subjectRbLi7Si2O8:Eu2+-
dc.subjectgreen phosphors-
dc.subjecthigh efficiency-
dc.subjectvibronic coupling-
dc.subjectpc-WLEDs-
dc.titleLuminescence Characteristics and Vibronic Coupling Behavior of a Highly Efficient Eu2+-Activated RbLi7Si2O8 Green Phosphor for Wide Color Gamut WLEDs-
dc.typeArticle-
dc.identifier.emailXu, S: sjxu@hku.hk-
dc.identifier.authorityXu, S=rp00821-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1021/acsaelm.0c00779-
dc.identifier.scopuseid_2-s2.0-85097061221-
dc.identifier.hkuros321275-
dc.identifier.volume2-
dc.identifier.issue11-
dc.identifier.spage3749-
dc.identifier.epage3755-
dc.identifier.isiWOS:000595528400033-
dc.publisher.placeUnited States-

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