Effect of CaZrO3 Doping by Gd3+ on Phototherapy Lamp Phosphor Performance

2020 ◽  
pp. 105-115
Author(s):  
Neha Dubey ◽  
Marta Michalska-Domańska ◽  
Jagjeet Kaur Saluja ◽  
Janita Saji ◽  
Vikas Dubey
Keyword(s):  
Lamp Phosphor

Selective Masking and the “Lamp-Phosphor” Problem

1980 ◽  
Vol 32 (3) ◽  
pp. 491-495 ◽  
Author(s):  
Philip M. Merikle
Keyword(s):  
Short Wavelength ◽  
Rapid Onset ◽  
Backward Masking ◽  
Report Accuracy ◽  
Suggested Explanation ◽  
Lamp Phosphor

Mollon and Polden (1978) have suggested that selective backward masking, the greater masking of central than peripheral items in briefly-presented letter rows by a patterned stimulus, may be due to an advantage conveyed to the peripheral items by the more rapid onset of the short wavelengths emitted by tachistoscope lamps. This suggestion was evaluated by comparing report accuracy under mask and no mask conditions when the tachistoscope fields were viewed through yellow or red filters that eliminated all wavelengths below 510 and 590 nm, respectively. The results showed similar selective-masking effects with both filters. Since selective masking occurs even when the short wavelength emissions are eliminated, Mollon and Polden's suggested explanation for selective masking must be rejected.

scholarly journals Rare-earth recycling using a functionalized ionic liquid for the selective dissolution and revalorization of Y2O3:Eu3+ from lamp phosphor waste

2015 ◽  
Vol 17 (2) ◽  
pp. 856-868 ◽  
Author(s):  
David Dupont ◽  
Koen Binnemans
Keyword(s):  
Ionic Liquid ◽  
Rare Earth ◽  
Selective Dissolution ◽  
Recycling Process ◽  
Functionalized Ionic Liquid ◽  
Rare Earth Recycling ◽  
Lamp Phosphor

A recycling process for lamp phosphor waste has been developed based on the selective dissolution and revalorization of the valuable red lamp phosphor Y2O3:Eu3+ in the functionalized ionic liquid [Hbet][Tf2N].

Photoluminescence studies and Synthesis of BaSO 3 Cl 2 :Ce 3+ blue emitting lamp phosphor

Luminescence ◽  
2020 ◽  
Author(s):  
V.R. Panse ◽  
D.B. Zade ◽  
Jog Milind ◽  
S.J. Dhoble ◽  
Korhan Cengiz
Keyword(s):  
Photoluminescence Studies ◽  
Lamp Phosphor

Influence of Impurities on the Luminescence Quantum Efficiency of the Lamp Phosphor  ( Ce , Gd , Tb ) MgB5 O 10

1994 ◽  
Vol 141 (8) ◽  
pp. 2201-2207 ◽  
Author(s):  
W. van Schaik ◽  
S. H. M. Poort ◽  
J. J. H. Schlotter ◽  
E. Dorrestijn ◽  
G. Blasse
Keyword(s):  
Quantum Efficiency ◽  
O 10 ◽  
Influence Of Impurities ◽  
Lamp Phosphor

Spectral tuning and energy transfer in a potential fluorescent lamp phosphor BaMg2Al6Si9O30:Eu2+

2012 ◽  
Vol 132 (9) ◽  
pp. 2439-2442 ◽  
Author(s):  
Wei Lü ◽  
Yongshi Luo ◽  
Zhendong Hao ◽  
Xia Zhang ◽  
Xiaojun Wang ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Fluorescent Lamp ◽  
Spectral Tuning ◽  
Lamp Phosphor

scholarly journals Photochemical recycling of europium from Eu/Y mixtures in red lamp phosphor waste streams

2015 ◽  
Vol 17 (4) ◽  
pp. 2180-2187 ◽  
Author(s):  
Bart Van den Bogaert ◽  
Daphné Havaux ◽  
Koen Binnemans ◽  
Tom Van Gerven
Keyword(s):  
Selective Separation ◽  
Separation Technique ◽  
Waste Streams ◽  
Highly Efficient ◽  
Lamp Phosphor

A highly efficient and selective separation technique to remove europium from Eu/Y mixtures, in order to recycle europium from red lamp phosphors.

scholarly journals Selective Extraction of Red Phosphor (Y2O3:Eu3+) Constituents from Waste Fluorescent Lamps Phosphor Using Acid Leaching

2018 ◽  
Vol 15 (3) ◽  
Author(s):  
Parul Johar ◽  
Vishal Jangir ◽  
Yogita Choudhary ◽  
Sudhanshu Mallick
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Acid Leaching ◽  
Xrd Analysis ◽  
Selective Extraction ◽  
Phosphor Powder ◽  
Red Phosphor ◽  
Fluorescent Lamps ◽  
Refinement Method ◽  
Lamp Phosphor

Modern fluorescent lamp phosphor powder contains tricolor phosphor. This tricolor phosphor consists of three different types of rare earth phosphors: red (YOX), green (CMAT/LAP) and blue (BAM); mixed in varying proportions. The exact separation of these three rare earth phosphors is essential in order to precisely recover the contained rare earth elements from waste lamps phosphor. In this present work, we reported an efficient methodology for the separation of these three tricolor phosphors and the selective extraction of predominantly presented red phosphor (YOX) constituents using acid leaching. The waste phosphor powder was leached with different acids: both organic and inorganic type. The 3 M H2SO4 leaching was found to be most suitable for the selective extraction of red phosphor constituents, i.e. Y and Eu. The recovered phosphor powder was analyzed with SEM/EDS and XRD analysis. The obtained XRD pattern was refined using Rietveld refinement method for the quantification of phases present. Recovered red phosphor powder contained three main crystalline phases Y2O3, Eu2O3 and Y2OS2. KEYWORDS: Waste Lamp Phosphor; Tricolor Phosphor; Rare Earth Elements; Acid Leaching

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