View in EDS

A novel white Y2(Ti0.8Hf0.2)2O7: Eu phosphors regulated by HfO2 exhibiting low color shifting for high temperature.

Saved in:
Bibliographic Details
Title: A novel white Y2(Ti0.8Hf0.2)2O7: Eu phosphors regulated by HfO2 exhibiting low color shifting for high temperature.
Authors: Han, Zhanwen1 (AUTHOR), Yu, Hongquan1 (AUTHOR) yuhq7808@126.com, Liu, Tianshuo2 (AUTHOR), Sun, Jiashi1 (AUTHOR), Li, Xiangping1 (AUTHOR) lixp@dlmu.edu.cn, Chen, Baojiu1 (AUTHOR) bjchen@dlmu.edu.cn
Source: Spectrochimica Acta Part A: Molecular & Biomolecular Spectroscopy. Dec2024, Vol. 323, pN.PAG-N.PAG. 1p.
Subjects: Low temperatures, Visible spectra, Reducing agents, Color temperature, High temperatures
Abstract: White Y 2 (Ti 0.8 Hf 0.2) 2 O 7 :0.2Eu phosphors exhibit a high color rendering index (Ra = 83–90.2), low color temperature (CCT = 4243 K), and low color shifting (Δ s = 2.83 × 10−2) at 503 K, and are suitable for use in white LED devices. [Display omitted] • White Y 2 (Ti 0.8 Hf 0.2) 2 O 7 :Eu phosphors with low color shifting under high temperature (503 K) were synthesized. • The formation of Eu2+ ions was caused by the introduction of HfO 2 and did not require additional reducing agents. • Y 2 (Ti 0.8 Hf 0.2) 2 O 7 :0.2Eu phosphors exhibit a high color rendering index (Ra = 83–90.2) and low color shifting (Δ s =2.83 × 10−2) under high temperature. • The WLED device exhibits good color coordinates (0.345, 0.358) and a high Ra value of 90.1 at a 300 mA current. The development of white phosphors that can be activated in near-ultraviolet light is highly important in the field of LED lighting. In this work, a series of color-tunable Y 2 (Ti 1-x Hf x) 2 O 7 :Eu phosphors were prepared by adjusting the HfO 2 and Eu3+ concentrations. In particular, white Y 2 (Ti 0.8 Hf 0.2) 2 O 7 :Eu phosphors were successfully synthesized and emitted a broad band covering the entire visible light region upon excitation with 340 nm UV light. The white banded materials were composed of Eu2+ and Eu3+ emissions and HfO 2 defect emission. The formation of Eu2+ ions was caused by the introduction of HfO 2, which causes self-reduction of Eu3+ ions but does not require additional reducing agents. The white Y 2 (Ti 0.8 Hf 0.2) 2 O 7 :Eu phosphors exhibit low color shifting at high temperature, which is very important for LED applications. The chromaticity shift of the Y 2 (Ti 0.8 Hf 0.2) 2 O 7 :0.2Eu phosphor is 2.83 × 10−2 at 503 K, which is only 54.8 % that of commercial three-color white phosphors at the same temperature. The Ra value did not decrease significantly with increasing temperature and reached 90.2 at 383 K. Y 2 (Ti 0.8 Hf 0.2) 2 O 7 :0.2Eu phosphors were assembled with a 365 nm LED chip to fabricate a WLED device that showed excellent white-colored coordinates (0.345, 0.358) and a high Ra value of 90.1 under a 300 mA current. [ABSTRACT FROM AUTHOR]
Copyright of Spectrochimica Acta Part A: Molecular & Biomolecular Spectroscopy is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
FullText Text:
  Availability: 0
Header DbId: egs
DbLabel: Engineering Source
An: 179239877
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
IllustrationInfo
Items – Name: Title
  Label: Title
  Group: Ti
  Data: A novel white Y2(Ti0.8Hf0.2)2O7: Eu phosphors regulated by HfO2 exhibiting low color shifting for high temperature.
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Han%2C+Zhanwen%22">Han, Zhanwen</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yu%2C+Hongquan%22">Yu, Hongquan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> yuhq7808@126.com</i><br /><searchLink fieldCode="AR" term="%22Liu%2C+Tianshuo%22">Liu, Tianshuo</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Sun%2C+Jiashi%22">Sun, Jiashi</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Li%2C+Xiangping%22">Li, Xiangping</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> lixp@dlmu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Chen%2C+Baojiu%22">Chen, Baojiu</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> bjchen@dlmu.edu.cn</i>
– Name: TitleSource
  Label: Source
  Group: Src
  Data: <searchLink fieldCode="JN" term="%22Spectrochimica+Acta+Part+A%3A+Molecular+%26+Biomolecular+Spectroscopy%22">Spectrochimica Acta Part A: Molecular & Biomolecular Spectroscopy</searchLink>. Dec2024, Vol. 323, pN.PAG-N.PAG. 1p.
– Name: Subject
  Label: Subjects
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Low+temperatures%22">Low temperatures</searchLink><br /><searchLink fieldCode="DE" term="%22Visible+spectra%22">Visible spectra</searchLink><br /><searchLink fieldCode="DE" term="%22Reducing+agents%22">Reducing agents</searchLink><br /><searchLink fieldCode="DE" term="%22Color+temperature%22">Color temperature</searchLink><br /><searchLink fieldCode="DE" term="%22High+temperatures%22">High temperatures</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: White Y 2 (Ti 0.8 Hf 0.2) 2 O 7 :0.2Eu phosphors exhibit a high color rendering index (Ra = 83–90.2), low color temperature (CCT = 4243 K), and low color shifting (Δ s = 2.83 × 10−2) at 503 K, and are suitable for use in white LED devices. [Display omitted] • White Y 2 (Ti 0.8 Hf 0.2) 2 O 7 :Eu phosphors with low color shifting under high temperature (503 K) were synthesized. • The formation of Eu2+ ions was caused by the introduction of HfO 2 and did not require additional reducing agents. • Y 2 (Ti 0.8 Hf 0.2) 2 O 7 :0.2Eu phosphors exhibit a high color rendering index (Ra = 83–90.2) and low color shifting (Δ s =2.83 × 10−2) under high temperature. • The WLED device exhibits good color coordinates (0.345, 0.358) and a high Ra value of 90.1 at a 300 mA current. The development of white phosphors that can be activated in near-ultraviolet light is highly important in the field of LED lighting. In this work, a series of color-tunable Y 2 (Ti 1-x Hf x) 2 O 7 :Eu phosphors were prepared by adjusting the HfO 2 and Eu3+ concentrations. In particular, white Y 2 (Ti 0.8 Hf 0.2) 2 O 7 :Eu phosphors were successfully synthesized and emitted a broad band covering the entire visible light region upon excitation with 340 nm UV light. The white banded materials were composed of Eu2+ and Eu3+ emissions and HfO 2 defect emission. The formation of Eu2+ ions was caused by the introduction of HfO 2, which causes self-reduction of Eu3+ ions but does not require additional reducing agents. The white Y 2 (Ti 0.8 Hf 0.2) 2 O 7 :Eu phosphors exhibit low color shifting at high temperature, which is very important for LED applications. The chromaticity shift of the Y 2 (Ti 0.8 Hf 0.2) 2 O 7 :0.2Eu phosphor is 2.83 × 10−2 at 503 K, which is only 54.8 % that of commercial three-color white phosphors at the same temperature. The Ra value did not decrease significantly with increasing temperature and reached 90.2 at 383 K. Y 2 (Ti 0.8 Hf 0.2) 2 O 7 :0.2Eu phosphors were assembled with a 365 nm LED chip to fabricate a WLED device that showed excellent white-colored coordinates (0.345, 0.358) and a high Ra value of 90.1 under a 300 mA current. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Spectrochimica Acta Part A: Molecular & Biomolecular Spectroscopy is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=179239877
RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1016/j.saa.2024.124935
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Low temperatures
        Type: general
      – SubjectFull: Visible spectra
        Type: general
      – SubjectFull: Reducing agents
        Type: general
      – SubjectFull: Color temperature
        Type: general
      – SubjectFull: High temperatures
        Type: general
    Titles:
      – TitleFull: A novel white Y2(Ti0.8Hf0.2)2O7: Eu phosphors regulated by HfO2 exhibiting low color shifting for high temperature.
        Type: main
  BibRelationships:
    HasContributorRelationships:
      – PersonEntity:
          Name:
            NameFull: Han, Zhanwen
      – PersonEntity:
          Name:
            NameFull: Yu, Hongquan
      – PersonEntity:
          Name:
            NameFull: Liu, Tianshuo
      – PersonEntity:
          Name:
            NameFull: Sun, Jiashi
      – PersonEntity:
          Name:
            NameFull: Li, Xiangping
      – PersonEntity:
          Name:
            NameFull: Chen, Baojiu
    IsPartOfRelationships:
      – BibEntity:
          Dates:
            – D: 15
              M: 12
              Text: Dec2024
              Type: published
              Y: 2024
          Identifiers:
            – Type: issn-print
              Value: 13861425
          Numbering:
            – Type: volume
              Value: 323
          Titles:
            – TitleFull: Spectrochimica Acta Part A: Molecular & Biomolecular Spectroscopy
              Type: main
ResultId 1