White-Light Upconversion and Application of Er3+/Tm3+ Co-Doped Ytterbium-Based Nanoparticles

doi:10.19894/j.issn.1000-0518.230210

Chinese Journal of Applied Chemistry ›› 2023, Vol. 40 ›› Issue (12): 1623-1629.DOI: 10.19894/j.issn.1000-0518.230210

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White-Light Upconversion and Application of Er³⁺/Tm³⁺ Co-Doped Ytterbium-Based Nanoparticles

Zheng-Ce AN, Li-Ping WANG, Bo ZHOU()

State Key Laboratory of Luminescent Materials and Devices，School of Materials Science and Engineering，South China University of Technology，Guangzhou 510641，China

Received:2023-07-21 Accepted:2023-11-29 Published:2023-12-01 Online:2024-01-03
Contact: Bo ZHOU
About author:zhoubo@scut.edu.cn
Supported by:
the National Natural Science Foundation of China(51972119)

Abstract

Abstract:

Lanthanide ions doped white-light upconversion materials have important applications in solid state lighting， liquid crystal display and information anti-counterfeiting. However， previous research mainly focus on inert matrix materials， which are difficult to significantly increase the concentration of sensitizer， limiting the emission intensity of white-light upconversion. Herein， a LiYbF₄@LiYF₄ core-shell nanostructure design is proposed. By using the sensitizing LiYbF₄ nanocrystals as host doping with appropriate concentrations of Er³⁺ and Tm³⁺ activators， white-light upconversion emission is successfully achieved under 980 nm excitation. The LiYbF₄∶Er/Tm@LiYbF₄@LiYF₄∶Nd core-shell-shell nanostructure is further designed to realize the white-light emission under 980 and 808 nm dual-channel excitation through using additional sensitizer Nd³⁺. Finally， a package of both white-light upconversion nanoparticles and 940 nm near-infrared chips into LED device contributes to bright white-light emission by applying 300 mA current， showing great potential in white LED.

Key words: Upconversion luminescence, Lanthanide nanocrystals, Core-shell structure, White-light emission, Light-emitting diode

CLC Number:

O614.3

Zheng-Ce AN, Li-Ping WANG, Bo ZHOU. White-Light Upconversion and Application of Er³⁺/Tm³⁺ Co-Doped Ytterbium-Based Nanoparticles[J]. Chinese Journal of Applied Chemistry, 2023, 40(12): 1623-1629.

Figures/Tables 5

Fig.1 （A） XRD patterns of LiYbF4∶Er（0.5%）/Tm（1%） core and LiYbF4∶Er（0.5%）/Tm（1%）@LiYF4 core-shell nanoparticles；（B） TEM of patterns of LiYbF4∶Er（0.5%）/Tm（1%） core nanoparticles；（C） TEM of patterns of LiYbF4∶Er（0.5%）/Tm（1%）@LiYF4 core-shell nanoparticles

Fig.2 （A） Up-conversion emission spectra of LiYbF4∶Er（0.2%~2%）/Tm（1%）@LiYF4 core-shell nanoparticles undert 980 nm excitation；（B） CIE chromaticity diagram of the samples in Fig.2（A）；（C） Up-conversion emission spectra of LiYbF4∶Er（0.5%）/Tm（0.4%~1%）@LiYF4 core-shell nanoparticles under 980 nm excitation；（D） CIE chromaticity diagram of the samples in Fig.2（C）

Fig.3 Schematic diagram of the energy transfer process between lanthanide ions in LiYbF4∶Er/Tm@LiYF4 core-shell nanoparticles

Fig. 4 （A） Schematic diagram of energy transfer in LiYbF4∶Er（0.5%）/Tm（0.6%）@LiYbF4@LiYF4∶Nd（15%） core-shell-shell structure；（B） Up-conversion emission spectra of the sample in （A） under 808 and 980 nm excitation， respectively；（C） and （D） Comparison of up-conversion emission spectra between LiYbF4∶Er/Tm（0.5%/0.6%）@LiYF4∶Yb（20%）@LiYF4∶Nd（15%） core-shell-shell nanoparticles and the sample in （A） at 808 and 980 nm excitation， respectively. Excitation power density of 808 and 980 nm laser： 71 W/cm2

Fig.5 LiYbF4∶Er（0.5%）/Tm（0.6%）@LiYF4 nanoparticles combined with 940 nm NIR chip package （A） without applied current appearance photo and （B） with applied 300 mA forward current white light emission photos；（C） Emission spectrum of LED device；（D） CIE coordinates of LED device

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White-Light Upconversion and Application of Er³⁺/Tm³⁺ Co-Doped Ytterbium-Based Nanoparticles

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