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Featured researches published by Haoyi Wu.


Journal of Materials Chemistry C | 2016

Multifunctional near-infrared emitting Cr3+-doped Mg4Ga8Ge2O20 particles with long persistent and photostimulated persistent luminescence, and photochromic properties

Yahong Jin; Yihua Hu; Lifang Yuan; Li Chen; Haoyi Wu; Guifang Ju; He Duan; Zhongfei Mu

Here we report a series of multifunctional Cr3+-doped magnesium gallogermanate particles. Several minutes of ultraviolet (UV) light excitation can lead to strong near-infrared (NIR) long persistent luminescence (LPL) at 600–850 nm with a long lasting time of at least 25 h. After the disappearance of LPL, NIR photostimulated persistent luminescence (PSPL) can be rejuvenated repeatedly several times by an external photostimulus (visible or NIR light). Meanwhile, the material shows photochromic (PC) properties, i.e., the surface color can change reversibly between white/pale green and rosybrown with high fatigue resistance by alternating UV and visible light irradiation. When the temperature is increased to 300 °C, the induced rosybrown surface color can also be bleached. This new multifunctional material has potential applications in a wide range of fields, such as in vivo bio-imaging, optical information write-in and read-out media, erasable optical memory media and optical sensors. The continuous trap distribution and modulation were characterized. The optimum trap depth was determined to be 0.51–0.86 eV. In addition, we gained insight into the mechanism of multifunctional properties and the interconnection between them.


Journal of Physics D | 2009

Controllable optical properties by ratio of Sr/Ca in Sr1.97?xCaxMgSi2O7?:? {\rm Eu}_{0.01}^{2+} , {\rm Dy}_{0.02}^{3+} phosphors

Haoyi Wu; Yinhai Wang; Yihua Hu; Liuyong Deng; Wei Xie

The long afterglow phosphors Sr1.97−xCaxMgSi2O7 :  , (x = 0, 0.4, 0.8, 1.2, 1.6, 1.97) were synthesized by the high temperature solid-state reaction method. The phases were analyzed by x-ray powder diffraction. All the samples have a similar structure. A slight shift of the peaks, which implied a change of crystal plane spacing, was found. With a decrease in the Sr/Ca ratio, the crystal plane spacing became smaller. The red shift was found in the emission spectra, from 468 to 529 nm. The 5d level of the Eu2+ ion splits into two sets. With the decrease in the crystal plane spacing, the energy of one set becomes higher while the other one becomes lower. This leads to the red shift of the emission spectra. The afterglow time becomes shorter with the decreasing Sr/Ca ratio. The thermoluminescence curves, which imply the depth of the traps, conform to the various afterglow times of the samples. This is due to the greater ionization potential of the Dy ions with the decreasing crystal plane spacing.


Optical Materials Express | 2016

Luminescent properties of a green long persistent phosphor Li 2 MgGeO 4 :Mn 2+

Yahong Jin; Yihua Hu; Li Chen; Guifang Ju; Haoyi Wu; Zhongfei Mu; Miao He; Feihong Xue

A novel rare-earth ion free phosphor, Mn2+-activated Li2MgGeO4, was prepared by a high temperature solid-state reaction method. The phase structure was identified by XRD. We reported on its photoluminescence and long persistent luminescence properties. The green emission with a broad band centered at 525 nm corresponds to the 4T1(4G)–6A1(6S) transition of the Mn2+ ions. After irradiation by 254 nm UV light, green long persistent luminescence can be observed and last at least 5 h. Thermoluminescence was studied and the long persistent luminescence mechanism was also discussed in detail.


Chemical Engineering Journal | 2016

A deep red phosphor Li2MgTiO4:Mn4+ exhibiting abnormal emission: Potential application as color converter for warm w-LEDs

Yahong Jin; Yihua Hu; Haoyi Wu; He Duan; Li Chen; Yinrong Fu; Guifang Ju; Zhongfei Mu; Miao He


Journal of Luminescence | 2013

Luminescent properties of Eu3+ in MWO4 (M=Ca, Sr, Ba) matrix

Fengwen Kang; Yihua Hu; Li Chen; Xiaojuan Wang; Haoyi Wu; Zhongfei Mu


Journal of Luminescence | 2012

Luminescence properties of Y2O3:Bi3+, Ln3+ (Ln=Sm, Eu, Dy, Er, Ho) and the sensitization of Ln3+ by Bi3+

Guifang Ju; Yihua Hu; Li Chen; Xiaojuan Wang; Zhongfei Mu; Haoyi Wu; Fengwen Kang


Optical Materials | 2011

A red-emitting heavy doped phosphor Li6Y(BO3)3:Eu3+ for white light-emitting diodes

Guifang Ju; Yihua Hu; Haoyi Wu; Zhongfu Yang; Chujun Fu; Zhongfei Mu; Fengwen Kang


Journal of Luminescence | 2012

Luminescence and red long afterglow investigation of Eu3+–Sm3+ CO-doped CaWO4 phosphor

Fengwen Kang; Yihua Hu; Haoyi Wu; Zhongfei Mu; Guifang Ju; Chujun Fu; Nana Li


Journal of Luminescence | 2011

Photoluminescence and thermoluminescence of Ce3+ and Eu2+ in Ca2Al2SiO7 matrix

Haoyi Wu; Yihua Hu; Guifang Ju; Li Chen; Xiaojuan Wang; Zhongfu Yang


Optics and Laser Technology | 2012

A reddish orange-emitting stoichiometric phosphor K3Eu(PO4)2 for white light-emitting diodes

Guifang Ju; Yihua Hu; Li Chen; Xiaojuan Wang; Zhongfei Mu; Haoyi Wu; Fengwen Kang

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Yihua Hu

Guangdong University of Technology

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Guifang Ju

Guangdong University of Technology

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Fengwen Kang

Guangdong University of Technology

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Li Chen

Guangdong University of Technology

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Zhongfei Mu

Guangdong University of Technology

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Xiaojuan Wang

Guangdong University of Technology

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Yinhai Wang

Guangdong University of Technology

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Yahong Jin

Guangdong University of Technology

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Chujun Fu

Guangdong University of Technology

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Zhongfei Mou

Guangdong University of Technology

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