NIR light guided enhanced photoluminescence and temperature sensing in Ho3+/Yb3+/Bi3+ co-doped ZnGa2O4 phosphor

AbstractThe conversion of NIR light into visible light has been studied in Ho3+/Yb3+/Bi3+ co-doped ZnGa2O4 phosphor for the first time. The crystallinity and particles size of the phosphor increase through Bi3+ doping. The absorption characteristics of Ho3+, Yb3+ and Bi3+ ions are identified by the UV–vis-NIR measurements. The Ho3+ doped phosphor produces intense green upconversion (UC) emission under 980 nm excitations. The emission intensity ~ excitation power density plots show contribution of two photons for the UC emissions. The UC intensity of green emission is weak in the Ho3+ doped phosphor, which enhances upto 128 and 228 times through co-doping of Yb3+ and Yb3+/Bi3+ ions, respectively. The relative and absolute temperature sensing sensitivities of Ho3+/Yb3+/5Bi3+ co-doped ZnGa2O4 phosphor are calculated to be 13.6 × 10−4 and 14.3 × 10−4 K−1, respectively. The variation in concentration of Bi3+ ion and power density produces excellent color tunability from green to red via yellow regions. The CCT also varies with concentration of Bi3+ ion and power density from cool to warm light. The color purity of phosphor is achieved to 98.6% through Bi3+ doping. Therefore, the Ho3+/Yb3+/Bi3+:ZnGa2O4 phosphors can be suitable for UC-based color tunable devices, green light emitting diodes and temperature sensing.

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NaGd(WO4)2:Yb3+/Er3+ phosphors: hydrothermal synthesis, optical spectroscopy and green upconverted temperature sensing behavior

RSC Advances ◽

10.1039/c6ra01283c ◽

2016 ◽

Vol 6 (42) ◽

pp. 35152-35159 ◽

Cited By ~ 31

Author(s):

Jinsheng Liao ◽

Liling Nie ◽

Qi Wang ◽

Suijun Liu ◽

He-Rui Wen ◽

...

Keyword(s):

Hydrothermal Synthesis ◽

Temperature Dependence ◽

Power Density ◽

Optical Spectroscopy ◽

Excitation Power ◽

Emission Peak ◽

Temperature Sensing ◽

Luminescence Spectra ◽

Excitation Power Density

Temperature dependence of the green UC luminescence spectra of NGW:Yb3+/Er3+ phosphor under 980 nm excitation (the spectra are normalized to the emission peak at 554 nm. The excitation power density is 3 W cm−2).

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The sensitization of laser-induced heat of Er3+ doped Y2O3 nanocrystals by codoped with Mn2+

International Journal of Modern Physics B ◽

10.1142/s0217979215501581 ◽

2015 ◽

Vol 29 (22) ◽

pp. 1550158

Author(s):

Yunfeng Bai ◽

Minjie Luan ◽

Linjun Li ◽

Zhelong He ◽

Dongyu Li

Keyword(s):

Power Density ◽

Thermal Emission ◽

Energy Levels ◽

Excitation Power ◽

Threshold Power ◽

Excitation Power Density ◽

Ir Laser ◽

Order Of Magnitude ◽

Low Threshold ◽

Density Threshold

Low threshold power density cw laser-induced heat has been observed in [Formula: see text] and [Formula: see text] codoped [Formula: see text] nanocrystals under excitation by a 980 nm IR laser. Codoped [Formula: see text] remarkably reduces the power density threshold of laser-induced heat compared with [Formula: see text] doped [Formula: see text] nanocrystals. When the excitation power density exceed [Formula: see text], [Formula: see text] codoped [Formula: see text] nanocrystals emit strong blackbody radiation. The thermal emission of [Formula: see text] should originate from the multiphonon relaxation between neighboring energy levels. One additional UC-PL enhancement is observed. The UC-PL intensity can be enhanced by an order of magnitude through high temperature calcination caused by light into heat.

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Excitation-Power-Density Dependent ac Surface Photovoltages in Radiation-Damaged Si Wafer

Japanese Journal of Applied Physics ◽

10.1143/jjap.23.778 ◽

1984 ◽

Vol 23 (Part 1, No. 6) ◽

pp. 778-779 ◽

Cited By ~ 9

Author(s):

Chusuke Munakata ◽

Noriaki Honma ◽

Hajime Hayakawa

Keyword(s):

Power Density ◽

Excitation Power ◽

Excitation Power Density ◽

Density Dependent ◽

Si Wafer

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Effect of excitation power density on the upconversion luminescence of LaF3:Yb3+, Er3+ nanocrystals

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2009.05.145 ◽

2009 ◽

Vol 485 (1-2) ◽

pp. 493-496 ◽

Cited By ~ 23

Author(s):

Yuqiu Qu ◽

Xianggui Kong ◽

Yajuan Sun ◽

Qinghui Zeng ◽

Hong Zhang

Keyword(s):

Power Density ◽

Upconversion Luminescence ◽

Excitation Power ◽

Excitation Power Density

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Rod-shaped NaY(MoO4)2:Sm3+/Yb3+ nanoheaters for photothermal conversion: Influence of doping concentration and excitation power density

Sensors and Actuators B Chemical ◽

10.1016/j.snb.2016.04.162 ◽

2016 ◽

Vol 234 ◽

pp. 286-293 ◽

Cited By ~ 52

Author(s):

Hui Zheng ◽

Baojiu Chen ◽

Hongquan Yu ◽

Xiangping Li ◽

Jinsu Zhang ◽

...

Keyword(s):

Power Density ◽

Doping Concentration ◽

Excitation Power ◽

Excitation Power Density ◽

Photothermal Conversion

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Bi3+ Effects on Down-/up-conversion Luminescence, Temperature Sensing and Optical Transition Properties in Bi3+/Er3+ Co-doped YNbO4 Phosphors

10.21203/rs.3.rs-76690/v1 ◽

2020 ◽

Author(s):

Xin Wang ◽

Xiangping Li ◽

Hongquan Yu ◽

Sai Xu ◽

Jiashi Sun ◽

...

Keyword(s):

Near Infrared ◽

Optical Transition ◽

Green Emission ◽

Radiative Transition ◽

Solid State Reaction Method ◽

Temperature Sensing ◽

Infrared Light ◽

Luminescence Spectra ◽

Experimental Values ◽

Co Doped

Abstract A series of Bi3+ single-doped and Bi3+/Er3+ co-doped YNbO4 phosphors with various concentrations of Bi3+ ions were prepared by a conventional high temperature solid-state reaction method. The results of XRD and Rietveld refinement confirmed that monoclinic phase YNbO4 samples were achieved. The down-/up-conversion luminescence of Er3+ ions were investigated under the excitation of ultraviolet light (327 nm) and near infrared light (980 nm). Under 327 nm excitation, broad visible emission band from Bi3+ ions and characteristic green emission peaks from Er3+ ions were simultaneously observed, while only strong green emissions from Er3+ ions were detected upon excitation of 980 nm. Remarkable emission enhancement was observed in down-/up-conversion luminescence processes by introducing Bi3+ ions into Er3+-doped YNbO4 phosphors. By analyzing the laser working current dependent up-conversion luminescence spectra, two-photon processes were confirmed to be responsible for both the green and the red up-conversion emissions of Er3+ ion. The temperature sensing property of Er3+ was studied by using the temperature dependent up-conversion luminescence spectra and it was found that the temperature sensitivity was sensitive to the doping concentration of Bi3+ ions. By comparing the experimental values of the radiative transition rate ratio of the two green emission levels of Er3+ ions and the theoretical values calculated by Judd-Ofelt (J-O) theory, it was concluded that energy level splitting had significant influences on the temperature sensing property of Er3+ ions.

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