Enhancement of upconversion luminescence of Y2O 3:Er3+ nanocrystals by codoping Li+-Zn 2+

Huijuan Liang; Yangdong Zheng; Guanying Chen; Li Wu; Zhiguo Zhang; Wenwu Cao

doi:10.1016/j.jallcom.2010.09.044

Enhancement of upconversion luminescence of Y₂O ₃:Er³⁺ nanocrystals by codoping Li⁺-Zn ²⁺

Huijuan Liang
, Yangdong Zheng
, Guanying Chen
, Li Wu
, Zhiguo Zhang^*
, Wenwu Cao

^*Corresponding author for this work

School of Chemistry and Chemical Engineering

Harbin Institute of Technology
Pennsylvania State University

Research output: Contribution to journal › Article › peer-review

67 Scopus citations

Abstract

The upconversion (UC) luminescence in sol-gel synthesized Li⁺, Zn²⁺, or Li⁺-Zn²⁺ codoped Y₂O ₃:Er³⁺ nanocrystals were investigated under the excitation of a 970 nm diode laser. Compared to undoped Y₂O₃:Er ³⁺ samples, proper doping of Li⁺-Zn²⁺ leads to an drastic increase of the UC luminescence centered at 560 nm by a factor of 28. The UC luminescence enhancement is a result of the increased lifetime of the intermediate state ⁴I_11/2 (Er). The intensity ratio of the green over red emissions (green/red) is also affected by the codoping of Zn²⁺, Li⁺ and Li⁺-Zn²⁺ ions. Our results demonstrated that the Li⁺-Zn²⁺ codoping in Y ₂O₃:Er³⁺ phosphors produced remarkable enhancement of the UC luminescence and green/red ratio, making this nanocrystal a promising candidate for photonic and biological applications.

Original language	English
Pages (from-to)	409-413
Number of pages	5
Journal	Journal of Alloys and Compounds
Volume	509
Issue number	2
DOIs	https://doi.org/10.1016/j.jallcom.2010.09.044
State	Published - 12 Jan 2011

Keywords

Nanocrystals
Rare earth
Upconversion
YO

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10.1016/j.jallcom.2010.09.044

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title = "Enhancement of upconversion luminescence of Y2O 3:Er3+ nanocrystals by codoping Li+-Zn 2+",

abstract = "The upconversion (UC) luminescence in sol-gel synthesized Li+, Zn2+, or Li+-Zn2+ codoped Y2O 3:Er3+ nanocrystals were investigated under the excitation of a 970 nm diode laser. Compared to undoped Y2O3:Er 3+ samples, proper doping of Li+-Zn2+ leads to an drastic increase of the UC luminescence centered at 560 nm by a factor of 28. The UC luminescence enhancement is a result of the increased lifetime of the intermediate state 4I11/2 (Er). The intensity ratio of the green over red emissions (green/red) is also affected by the codoping of Zn2+, Li+ and Li+-Zn2+ ions. Our results demonstrated that the Li+-Zn2+ codoping in Y 2O3:Er3+ phosphors produced remarkable enhancement of the UC luminescence and green/red ratio, making this nanocrystal a promising candidate for photonic and biological applications.",

keywords = "Nanocrystals, Rare earth, Upconversion, YO",

author = "Huijuan Liang and Yangdong Zheng and Guanying Chen and Li Wu and Zhiguo Zhang and Wenwu Cao",

year = "2011",

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day = "12",

doi = "10.1016/j.jallcom.2010.09.044",

language = "英语",

volume = "509",

pages = "409--413",

journal = "Journal of Alloys and Compounds",

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T1 - Enhancement of upconversion luminescence of Y2O 3:Er3+ nanocrystals by codoping Li+-Zn 2+

AU - Liang, Huijuan

AU - Zheng, Yangdong

AU - Chen, Guanying

AU - Wu, Li

AU - Zhang, Zhiguo

AU - Cao, Wenwu

PY - 2011/1/12

Y1 - 2011/1/12

N2 - The upconversion (UC) luminescence in sol-gel synthesized Li+, Zn2+, or Li+-Zn2+ codoped Y2O 3:Er3+ nanocrystals were investigated under the excitation of a 970 nm diode laser. Compared to undoped Y2O3:Er 3+ samples, proper doping of Li+-Zn2+ leads to an drastic increase of the UC luminescence centered at 560 nm by a factor of 28. The UC luminescence enhancement is a result of the increased lifetime of the intermediate state 4I11/2 (Er). The intensity ratio of the green over red emissions (green/red) is also affected by the codoping of Zn2+, Li+ and Li+-Zn2+ ions. Our results demonstrated that the Li+-Zn2+ codoping in Y 2O3:Er3+ phosphors produced remarkable enhancement of the UC luminescence and green/red ratio, making this nanocrystal a promising candidate for photonic and biological applications.

AB - The upconversion (UC) luminescence in sol-gel synthesized Li+, Zn2+, or Li+-Zn2+ codoped Y2O 3:Er3+ nanocrystals were investigated under the excitation of a 970 nm diode laser. Compared to undoped Y2O3:Er 3+ samples, proper doping of Li+-Zn2+ leads to an drastic increase of the UC luminescence centered at 560 nm by a factor of 28. The UC luminescence enhancement is a result of the increased lifetime of the intermediate state 4I11/2 (Er). The intensity ratio of the green over red emissions (green/red) is also affected by the codoping of Zn2+, Li+ and Li+-Zn2+ ions. Our results demonstrated that the Li+-Zn2+ codoping in Y 2O3:Er3+ phosphors produced remarkable enhancement of the UC luminescence and green/red ratio, making this nanocrystal a promising candidate for photonic and biological applications.

KW - Nanocrystals

KW - Rare earth

KW - Upconversion

KW - YO

UR - https://www.scopus.com/pages/publications/78149283132

U2 - 10.1016/j.jallcom.2010.09.044

DO - 10.1016/j.jallcom.2010.09.044

M3 - 文章

AN - SCOPUS:78149283132

SN - 0925-8388

VL - 509

SP - 409

EP - 413

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

IS - 2

ER -

Enhancement of upconversion luminescence of Y₂O ₃:Er³⁺ nanocrystals by codoping Li⁺-Zn ²⁺

Abstract

Keywords

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