61894-01-7Relevant articles and documents
Luminescence properties of Tm3+ ions single-doped YF3 materials in an unconventional excitation region
Chen, Yuan,Liu, Qing,Lin, Han,Yan, Xiaohong
, p. 505 - 510 (2018)
According to the spectral distribution of solar radiation at the earth's surface, under the excitation region of 1150 to 1350?nm, the up-conversion luminescence of Tm3+ ions was investigated. The emission bands were matched well with the spectr
Improving upconversion emission of NaYF4:Yb3+, Er3+ nanoparticles by coupling Au nanoparticles and photonic crystals: The detection enhancement of Rhodamine B
Ma, Yingjin,Zhu, Jialun,Yang, Zhengwen,Zhang, Hailu,Qiu, Jianbei,Song, Zhiguo
, p. 1265 - 1273 (2019)
The upconversion (UC) nanoparticles (NPs) based sensor exhibits the potential application for the detection of dyes, heavy metal ions and DNA et al. However, the application of upconversion NPs based sensor was limited due to its low UC luminescence intensity. In the present work, the SiO2 opal photonic crystals were prepared by the self-assembly technology. After infiltration of SiO2 opal by the transparent chloroauric acid solution and the following sintering at the high temperature, the Au NPs/opal hybrids were prepared. The Au NPs/opal hybrids result in the enhancement of excited electric field, which can be served as the template of UC emission enhancement of NaYF4:Yb3+, Er3+ NPs exited at the 980 nm. The corresponding maximum UC emission enhancement was about 17-fold. The detection of Rhodamine B was realized by monitoring the changing of green UC intensity of NaYF4:Yb3+, Er3+ NPs. In comparison with pure NaYF4:Yb3+, Er3+ NPs, the sensor sensitivity of NaYF4:Yb3+, Er3+ NPs deposited on the Au NPs/opal hybrid was increased by about the 35-factors, which exhibits a low detection limit of 164 μM and a high sensitivity of 1.15 μM?1. The present work demonstrated that this solid sensor exhibits potential applications in heavy metal ions and DNA et al.
A convenient preparation of nano-powders of Y2O3, Y3Al5O12 and Nd:Y3Al5O12 and study of the photoluminescent emission properties of the neodymium doped oxide
Belli Dell'Amico, Daniela,Biagini, Paolo,Bongiovanni, Giovanni,Chiaberge, Stefano,Di Giacomo, Alessio,Labella, Luca,Marchetti, Fabio,Marra, Gianluigi,Mura, Andrea,Quochi, Francesco,Samaritani, Simona,Sarritzu, Valerio
, p. 149 - 157 (2018)
[Y(O2CNBu2)3], has been prepared by extraction of the Y3+ ions from aqueous solution into heptane by the NHBu2/CO2 system. Exhaustive hydrolysis of [Y(O2CNBu2)3] produced the yttrium carbonate [Y2(CO3)3?n H2O] (n = 2–3), that was converted to Y2O3 by thermal treatment at 550 °C for 12 h. The exhaustive hydrolysis of [Y(O2CNBu2)3] and [Al(OBu)3] (Y/Al molar ratio = 3/5) carried out at room temperature yielded an intermediate mixed carbonate, that, upon heating at 950 °C for 12 h, was converted to Y3Al5O12. The exhaustive hydrolysis of [Y(O2CNBu2)3] and [Al(OBu)3] was repeated in the presence of [Nd(O2CNBu2)3] (Nd/Y molar ratio = 0.07;(Nd + Y)/Al molar ratio = 3:5). The neodymium doped garnet Nd:Y3Al5O12 was obtained, through the intermediate formation of a mixed hydroxo-carbonate. For comparison, the neodymium doped garnet was prepared also starting from N,N-dialkylcarbamato complexes of all three metals, [Y(O2CNBu2)3], [Nd(O2CNBu2)3] and [Al2(O2CNiPr2)6] (Nd/Y molar ratio = 0.07;(Nd + Y)/Al molar ratio = 3:5). Also in this case the intermediate mixed hydroxo-carbonate, after heating at 950 °C for 12 h, evolved to Nd:Y3Al5O12. FTIR, XRD, SEM, TGA measurements were used for the characterization of the obtained materials. Preliminary studies of the photoluminescent emission properties were carried out on Nd:Y3Al5O12. Photoluminescence dynamics have been investigated by means of femtosecond laser pulses and nanosecond temporal resolution up to the millisecond range after excitation. All the luminescence traces have shown a decay time of the order 200 microseconds indicating its potential as a laser medium for infrared emission at 1064 nm.
Multifunctional polyoxometalates-modified upconversion nanoparticles: Integration of electrochromic devices and antioxidants detection
Zhai, Yanling,Zhu, Chengzhou,Ren, Jiangtao,Wang, Erkang,Dong, Shaojun
, p. 2400 - 2402 (2013)
We report a novel design, based on a combination of lanthanide-doped upconversion nanoparticles and polyoxometalates, for electrically controlled fluorescence switches and sensitive detection of antioxidants in aqueous solution.
Optical properties of Sr2YF7 material doped with Yb3+, Er3+, and Eu3+ ions for solar cell application
Dao, Van-Duong,Huy, Bui The,Kwon, Dae Hyun,Lee, Seong-Soo,Lee, Yong-Ill,Truong, Hai Bang
, (2021/12/20)
The optical properties and applications of lanthanide-doped upconversion materials have been emerged due to their advantages such as high penetrated length, low ratios of signal and noise, and low toxicity. In this study, we present the preparation of Sr2YF7 (SYF) doped with Yb3+, Er3+, and Eu3+ ions and its application as a component of the working electrode for solar cells. The prepared material exhibits strong upconversion emission, which originated from Yb-Er pairs under an excitation of 980 nm wavelength, and down-shifting emission-related with Eu3+ ions. The material was characterized by X-ray diffraction (XRD), diffuse reflectance spectroscopy (DRS), FE-SEM, and fluorescent spectroscopy. The performance of color emission was evaluated by Commission International de I′Eclairage (CIE) chromaticity coordinates. J-V measurements were performed for estimating the contribution of the prepared material on the power conversion efficiency of dye-sensitized solar cells. The power conversion efficiency of dye-sensitized solar cells containing SYF3-coated TiO2 was increased by 20.9% versus those using undoped SYF - TiO2.
Encapsulation of lead halide perovskite quantum dots in mesoporous NaYF4matrices with enhanced stability for anti-counterfeiting
Che, Hailin,Cheng, Ziyong,Dang, Peipei,Lin, Jun,Wei, Yi
, p. 10299 - 10309 (2021/08/03)
All-inorganic cesium lead halide (CsPbX3, X = Cl, Br, and I) perovskite quantum dots (PQDs) have great potential application due to their unique optoelectronic properties. However, poor luminescence stability caused by some inevitable factors such as light, moisture and heat always restricts their practical application. In this work, the stability of CsPbX3(X = Cl0.5Br0.5, Br, and Br0.5I0.5) PQDs is improved by encapsulating them in stable hollow mesoporous NaYF4:Yb,Tm nanoparticles (HMNPs). Compared to pristine PQDs, HMNP-PQD composites exhibit stable photoluminescence properties that can be maintained for more than 60 days under ambient atmospheric conditions. Thanks to the protection of HMNPs, the composites show much higher long-term stability in highly humid air and enhanced stability against UV light treatment compared to naked CsPbBr3PQDs. Based on the proposed confinement effects of PQDs coordinated with the hollow mesoporous structure of NaYF4:Yb/Tm, the related structural model of NaYF4:Yb/Tm@PQD composites is discussed. Moreover, dual-mode luminescence can be observed in the NaYF4:Yb/Tm@PQD nanocomposites under 365 nm UV light and 980 nm laser excitation, indicating that the as-designed composites have great potential for dual-mode anti-counterfeiting application. This work provides a new idea for the stabilization and application of CsPbX3PQDs.
