Highly efficient saturated visible up-conversion photoluminescent Y2O3:Er3+ microspheres pumped with a 1.55 μm laser diode

Zhao, Jinbo; Wu, Lili; Zhang, Chuanjiang; Zeng, Bin; Lv, Yingnan; Li, Zhen; Jiang, Qinglong; Guo, Zhanhu

doi:10.1039/c7tc00757d

Cited by 16 publications

(8 citation statements)

References 44 publications

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“…The nanorods of Gd 2− x −y Yb x Er y O 3 (0≤ x ≤0.3; 0≤ y ≤0.1) were synthesised by using a customised hydrothermal method . Gd 2 O 3 , YbCl 3 and ErCl 3 were taken as starting materials.…”

Section: Methodsmentioning

confidence: 99%

“…The nanorods of Gd 2ÀxÀy Yb x Er y O 3 (0 x 0.3;0 y 0.1) were synthesised by using ac ustomised hydrothermal method. [52][53][54] Gd 2 O 3 , YbCl 3 and ErCl 3 were taken as starting materials. The stoichiometric amount of Gd 2 O 3 was dissolved in as olution containing 15 mL deionised (DI) water and 5mLn itric acid followed by continuous stirring at 80 8Cu ntil the solution turned into at ransparent nitrate solution.…”

Section: Synthesis Of Yb Er Doped Gd 2 O 3 Nanorodsmentioning

confidence: 99%

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A Novel Approach to Synthesise a Dual‐Mode Luminescent Composite Pigment for Uncloneable High‐Security Codes to Combat Counterfeiting

Kanika

Kumar

Singh

et al. 2017

Chemistry A European J

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A strategy is demonstrated to protect valuable items, such as currency, pharmaceuticals, important documents, etc. against counterfeiting, by marking them with luminescent security codes. These luminescent security codes were printed by employing luminescent ink formulated from a cost effective dual-mode luminescent composite pigment of Gd Yb Er O and Zn Mn S phosphors using commercially available PVC Gold medium. In the composite, Gd Yb Er O and Zn Mn S account for upconversion and downconversion processes, respectively. The synthesis procedure of the composite involves the admixing of Gd Yb Er O nanorods and Zn Mn S phosphor, synthesised by hydrothermal and facile solid-state reaction methods, respectively. The structural, morphological, microstructural, and photoluminescent features of Gd Yb Er O nanorods, Zn Mn S phosphor and composite were characterised by using XRD, SEM, TEM, and photoluminescence (PL) techniques, respectively. The distribution of PL intensity of the printed pattern was examined by using confocal PL mapping microscopy. The obtained results reveal that security codes printed using ink formulated from this bi-luminescent composite pigment provide dual-stage security against counterfeiting.

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Section: Methodsmentioning

confidence: 99%

Section: Synthesis Of Yb Er Doped Gd 2 O 3 Nanorodsmentioning

confidence: 99%

A Novel Approach to Synthesise a Dual‐Mode Luminescent Composite Pigment for Uncloneable High‐Security Codes to Combat Counterfeiting

Kanika

Kumar

Singh

et al. 2017

Chemistry A European J

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“…Most of the above stated materials have their own pros and cons, which is well investigated in our earlier studies ,,. Among all, semiconductor and lanthanide based luminescent materials are preferred more due to their unique qualities; highly stable, easy to produce in bulk, cost‐effective and have sharp emission with high intensity ,. Generally, single color emissive luminescent materials at single excitable wavelength are being developed for the anti‐counterfeiting purpose, but duplicity is easy of these kind of luminescent materials.…”

Section: Introductionmentioning

confidence: 95%

Triluminescent Functional Composite Pigment for Non‐Replicable Security Codes to Combat Counterfeiting

Nagpal

2018

ChemistrySelect

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Herein, a novel strategy to design of unclonable triluminescent pigment derived security ink is formulated to protect valuable merchandise, bank notes, pharmaceuticals, confidential documents etc. against counterfeiting, by embedding luminescent security codes/images. This triluminescent security ink is designed with combinatory chemistry that involves the strategically admixing of the triluminescent functional composite pigments in commercially available polyvinyl chloride gold medium. The triluminescent functional composite pigment is composed of NaYF4: Yb3+, Er3+(Sodium Yttrium Fluoride doped with Ytterbium and Erbium ions), NaYF4: Eu3+ (Sodium Yttrium Fluoride doped with Europium ion) and ZnO (Zinc Oxide) materials which have multifunctional features as it looks white in ambient light and shows strong green (NaYF4: Yb3+, Er3+), red (NaYF4: Eu3+) and green (ZnO) colors at three different excitations of 980 nm, 254 nm and 379 nm wavelengths, respectively. The structural/microstructural and photoluminescence properties of triluminescent functional composite are confirmed by XRD (X‐ray diffraction), SEM (Scanning electron microscope), TEM (Transmission electron microscope) and photoluminescence spectroscopic techniques, respectively. The quality and spatially distributed PL intensity of printed images/code from triluminescent ink was investigated by photoluminescence confocal mapping microscopy technique. Hence, the obtained results suggest that the security code/images printed by using ink formulated from triluminescent functional composite pigment provides one step ahead novel security features which could be easy to detect but extremely difficult to replicate.

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“…Fortunately, with the weapon of Science and Engineering, we could strongly fight back. [12][13][14][15][16] The advances in modern medicine, biology, chemistry, physics, civil engineering, medical instrument engineering and so on, are improving our life tremendously. For example, as shown in Fig.…”

Section: Scary Enough?mentioning

confidence: 99%

With Corona Virus, We Get Sick; With the Weapon of Science and Engineering, We Fight Back?

Jiang¹,

Guo²,

Yang³

et al. 2020

Eng. Sci.

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Highly efficient saturated visible up-conversion photoluminescent Y₂O₃:Er³⁺ microspheres pumped with a 1.55 μm laser diode

Abstract: Highly efficient saturation up-conversion bright visible luminescence was obtained using 1.55 μm laser diode excitation power as low as ∼0.03 W cm−2 in lab-synthesized Y2O3:Er3+ microspheres.

Cited by 16 publications

References 44 publications

A Novel Approach to Synthesise a Dual‐Mode Luminescent Composite Pigment for Uncloneable High‐Security Codes to Combat Counterfeiting

A Novel Approach to Synthesise a Dual‐Mode Luminescent Composite Pigment for Uncloneable High‐Security Codes to Combat Counterfeiting

Triluminescent Functional Composite Pigment for Non‐Replicable Security Codes to Combat Counterfeiting

With Corona Virus, We Get Sick; With the Weapon of Science and Engineering, We Fight Back?

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