Designing vivid green Sr9Al6O18:Er3+ phosphor for information encryption and nUV excitable cool-white LED applications

Swathi, B.N.; Krushna, B.R. Radha; Hariprasad, S. A.; Srikanth, Chivukula; Subramanian, Balanehru; Prasad, B. Daruka; Nagabhushana, H.

doi:10.1016/j.jlumin.2022.119618

Cited by 49 publications

(5 citation statements)

References 67 publications

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“…[19] Er 3 + ions can emit green light effectively due to normal transition from 2 H 11/2 , 4 S 3/2 , and 4 F 9/2 states to the 4 I 15/2 state. [12,20,21] These characteristics of RE ions with a suitable host is utilised to identify temperature by analysing the FIR of the TCELs. Recently, Ba 2 CaWO 6 : Er 3 + doped phosphors were reported by E. Sreeja et al for use in solid-state lighting.…”

Section: Introductionmentioning

confidence: 99%

“…It has long lifetimes because of strong optical absorption and PL in near ultraviolet (UV) regions [19] . Er 3+ ions can emit green light effectively due to normal transition from 2 H 11/2 , 4 S 3/2 , and 4 F 9/2 states to the 4 I 15/2 state [12,20,21] . These characteristics of RE ions with a suitable host is utilised to identify temperature by analysing the FIR of the TCELs.…”

Section: Introductionmentioning

confidence: 99%

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Green Emission of Erbium Doped SYW Phosphors for Optical Thermometry And Solid‐State Lighting

Kumari,

Rao,

Sinha

2024

ChemPhotoChem

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A series of Er3+ ions doped Sr9Y2W4O24 (SYW) phosphors have been synthesised using solid‐state reaction technique. For optical thermometry and solid state lighting applications, the crystal structure, morphological, and luminescence features of the SYW: Er3+ phosphors were explored. X‐ray diffraction (XRD) reveal that synthesised phosphors having single phase with a tetragonal crystal structure and I41/a space group. SEM was used to examine the morphological behaviour and presence of composition elements. The optical bandgap of the phosphor was evaluated using UV‐Vis diffuse reflection spectra (DRS). The photoluminescence (PL) emission spectra were captured under 380 nm excitation, and the peak with the maximum intensity was identified at 563 nm ascribed to transition 4S3/2 →4I15/2, that emits green color in visible region. The temperature dependent PL (TD‐PL) spectra show that SYW phosphor is substantially more thermally stable, having thermal activation energy of about 0.247 eV. Additionally, the fluorescence intensity ratio (FIR) was used to study the optical sensing characteristics of the thermal quenching transitions (2H11/2, 4S3/2) with maximum relative sensitivity (SR) and an absolute sensitivity (SA) being 1.33% K−1and 0.307% K‐1, respectively. All of the aforementioned findings demonstrate that SYW: Er3+ phosphors have potential for optical thermometry and other photonic devices.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Green Emission of Erbium Doped SYW Phosphors for Optical Thermometry And Solid‐State Lighting

Kumari,

Rao,

Sinha

2024

ChemPhotoChem

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“…Photoluminescent materials have trapping mechanisms that capture the energy from ultraviolet light for subsequent release in the form of afterglow (Van der Heggen et al 2022). Strontium aluminate phosphors are common materials used to create high-quality photoluminescence and color emission (Swathi et al 2023). Various colored luminescent powders are achieved by altering the preparation and the chemical makeup of doped strontium aluminate phosphors with europium and dysprosium for example (Haranath et al 2003;Khattab et al 2018;Peng et al 2022).…”

mentioning

confidence: 99%

“…Furthermore, white powder can be achieved by tridoped Gd 3 Ga 5 O 12 with Pr 31 , Tb 31 , Eu 31 , and a coolwhite luminescence is achieved by combining Pr 31 and Tb 31 luminescent centers in the GGG: Pr 31 , Tb 31 , Eu 31 phosphors (Ueda et al 2020). Strontium aluminate phosphors are common materials used to create high-quality photoluminescence and color emission (Swathi et al 2023). Various colored luminescent powders are achieved by altering the preparation and the chemical makeup of strontium aluminate phosphors doped with the europium and dysprosium (Haranath et al 2003;Khattab et al 2018;Peng et al 2022).…”

mentioning

confidence: 99%

“…Various studies have researched and incorporated luminescence in root tissues, leaves and fruits, ceramic surfaces, fabrics, and information encryption (Defrianto et al 2022;Gao et al 2009;Khattab et al 2018;Strock et al 2019;Swathi et al 2023). The persistent luminescence of cut flowers has recently been reported using green luminescence by means of glow-in-the-dark spray paint and highlighters (Pace et al 2022b) and blue luminescence by dip and spray of using a blue glowin-the-dark powder in a water-based solution (Pace et al 2022a).…”

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confidence: 99%

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Evaluating Various Colors of Persistent Luminescent Powders on Rose Cut Flowers

Pace,

Dunn,

Fontanier

2023

horts

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Rose cut flowers are popular in everyday bouquets or for special occasions, and tinting of the flowers by means of color addition increases the flowers economical value and aesthetic appeal. This study evaluated red and white luminescent rose cut flowers, which was achieved by applying six persistent luminescent powders. Solutions of each color were prepared by mixing 6 g of powder and 240 ml of deionized water and sprayed four times around the flower head plus a control. Images were taken of the flowers before ultraviolet blacklight exposure and after exposure to be later analyzed with ImageJ software. Daily measurements were taken including vase weight, average floral diameter, and visual deterioration based on scale of 1 to 4. Overall measurements included mean brightness; red, green, and blue measured values; dominant wavelengths of emitted color; flower diameter change rate; relative water percent; solution uptake rate; and vase solution uptake rate. For luminescent brightness mean without ultraviolet, white rose with blue powder had the greatest value. For luminescent brightness after ultraviolet exposure, white rose with green powder had the greatest value. With ultraviolet exposure, white roses with green powder had the greatest value followed by blue, orange, and white. Red powder on white and red roses experienced little to no luminescence before or after ultraviolet exposure. Mean and mode varied in their calculated dominant wavelengths; therefore, it is recommended to use mean values because more similarities in matching of the powder color and the calculated dominant wavelength were reported. Ultimately, white roses are preferred because they seemed to have greater health and luminescence compared with red roses, and green and blue powder would be recommended for luminescent application for brightness.

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AIEE—Active Green Fluorescence Imaging Technique for Latent Fingerprint Application

Purushothaman,

Nishanthi,

Induja

et al. 2024

Luminescence

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Latent fingerprint imaging is a crucial tool for national security and crime recognition, requiring environmentally sustainable, nontoxic materials. To address this need, we have developed a green fluorescence‐emitting material, THCHO, that binds effectively to latent fingerprints, enabling clear, high‐resolution visualization. The solution produces strong green fluorescence that highlights fingerprint imprints with exceptional detail and contrast. The material is applicable across various substrates, making it efficient for on‐site visualization. The synthesized organic conjugated material THCHO rapidly visualizes precise fingerprint substructures within 5 s using a simple spray method. It maintains high contrast and low interference across different substrates, such as glass, aluminum foil, plastic, and ironware, even in diverse backgrounds. Additionally, the THCHO material demonstrates high stability, retaining its fluorescence imaging capabilities for up to 35 days and after water washing. This is the first report of using a conjugated organic thiophene material for latent fingerprint fluorescence imaging, suggesting potential applications in other fields.

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Designing vivid green Sr9Al6O18:Er3+ phosphor for information encryption and nUV excitable cool-white LED applications

Cited by 49 publications

References 67 publications

Green Emission of Erbium Doped SYW Phosphors for Optical Thermometry And Solid‐State Lighting

Green Emission of Erbium Doped SYW Phosphors for Optical Thermometry And Solid‐State Lighting

Evaluating Various Colors of Persistent Luminescent Powders on Rose Cut Flowers

AIEE—Active Green Fluorescence Imaging Technique for Latent Fingerprint Application

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