Energy transfer in sensitized Ca3(PO4)2—Ce—Mn and CaSiO3—Pb—Mn

Botden, Th. P.J.; Kröger, F. A.

doi:10.1016/0031-8914(48)90011-1

Cited by 25 publications

(10 citation statements)

References 17 publications

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“…Pb and Mn, as reported by Botden and KrSger (10). The two curves for the quantum efficiency are in good agreement in the spectral region above about 2650A.…”

Section: Preparation Of Phosphors and Experimental Resultssupporting

confidence: 85%

“…The arrangement of the experimental apparatus is similar to that reported by Botden and KrSger (10) and is shown schematically in Fig. 1.…”

Section: Experimental Apparatusmentioning

confidence: 67%

“…The comparison method (1,6,8) is unsuitable to determine the absolute value of the quantum efficiency. In the present investigation, therefore, the first or direct optical method (9)(10)(11) was used to measure the wave-length dependence of many powder phosphors.…”

mentioning

confidence: 99%

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Wave-Length Dependence of the Quantum Efficiency and Absorption of Powder Phosphors

Uehara

Masuda

Kobuke

1960

J. Electrochem. Soc.

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A number of powder phosphors have been measured by a direct optical method. Results are compared with other published values. Although slight discrepancies are found for magnesium and calcium tungstate at the 2537A position, the maximum quantum efficiency for magnesium tungstate is in good agreement with the published values. Good agreement is also found for impurity-activated phosphors. New data are presented for a number of orthophosphates. The quantum efficiency curves decrease more rapidly than the absorption curves toward both longer and shorter wave lengths from the peak position. The peaks of the quantum efficiency curves lie at longer wave lengths than those of the absorption curves. Reasons for these differences are discussed.Knowledge of the wave-length dependence of the quantum efficiency and absorption of phosphors provides an important foundation for the theoretical interpretation of luminescent properties, as well as for the development or technical application of phosphors.The quantum efficiency of powder phosphors has been measured by several methods (1), i.e., by direct optical, lamp efficiency calculation, calorimetric, and comparison methods. The second method used by Thayers and Barnes (2) and others (3-6) consists of comparing the measured luminous efficiency of a fluorescent lamp with its calculated maximum efficiency. This method involves some ambiguous assumptions concerning the optical characteristics of the phosphor layer in the fluorescent lamp. With the third or calorimetric method (1, 7) it is difficult to carry out the measurement over a wide range of exciting wave lengths, because an intense source of ultraviolet radiation is required but not available. The comparison method (1,6,8) is unsuitable to determine the absolute value of the quantum efficiency. In the present investigation, therefore, the first or direct optical method (9-11) was used to measure the wave-length dependence of many powder phosphors.

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“…Pb and Mn, as reported by Botden and KrSger (10). The two curves for the quantum efficiency are in good agreement in the spectral region above about 2650A.…”

Section: Preparation Of Phosphors and Experimental Resultssupporting

confidence: 85%

“…The arrangement of the experimental apparatus is similar to that reported by Botden and KrSger (10) and is shown schematically in Fig. 1.…”

Section: Experimental Apparatusmentioning

confidence: 67%

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Wave-Length Dependence of the Quantum Efficiency and Absorption of Powder Phosphors

Uehara

Masuda

Kobuke

1960

J. Electrochem. Soc.

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“…The optical absorption of this exciton is assumed to be forbidden so that its existence is not normally recognized. This mechanism was suggested but not indorsed by Borden and Kroger (6).…”

Section: Quantum E~ciencymentioning

confidence: 90%

“…The sensitized luminescence of manganeseactivated phosphors has been the subject of numerous investigations: While a number of sensitized systems of simple structure, principally alkMi halides (1) and calcite (2), are known, the most recent investigations have been concerned with compounds of more complicated structure such as CaSiQ:(Pb + Mn) (3), Sr~(PO4)2:(Sn + Mn), Ca3(PO4)2: (Ce + Mn) (4), and 3Ca3(PO4)2CaFCI: (Sb + Mn) (5). Although the interest in the more complicated systems originated largely in their practical application, it is from these phosphors that the most recent information concerning the mechanism of energy transfer and the range of sensitizer-activator interaction has been derived (6,7,8). Alkali halides and calcite, either for reasons of low activator or sensitizer solubility or because of poor luminescence efficiency, are not well adapted to the detailed investigation of the transfer mechanism and range.…”

Section: Introductionmentioning

confidence: 99%

Sensitized Luminescence of CaF[sub 2]:(Ce + Mn)

Ginther

1954

J. Electrochem. Soc.

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Calcium fluoride activated by cerium and manganese is shown to be a sensitized phosphor of high quantum efficiency. Studies of its reflection and excitation spectrum reveal that both cerium singlets and aggregates of cerium ions serve as sensitizers for manganese. The range of interaction (K) over which energy may be transferred from sensitizer to activator was found to be from 30 to 80 lattice sites. Variation in K with increasing sensitizer and constant manganese concentration is interpreted as being due to the competition of two types of sensitizing centers rather than to an energy transfer between sensitizer ions.

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Zur Photochemie von Substitutions‐ und Isomerisierungsreaktionen von Komplexionen des III‐wertigen Chroms

Schläfer

1960

Zeitschrift für Elektrochemie, Berichte der Bunsengesellschaft

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Energy transfer in sensitized Ca3(PO4)2—Ce—Mn and CaSiO3—Pb—Mn

Cited by 25 publications

References 17 publications

Wave-Length Dependence of the Quantum Efficiency and Absorption of Powder Phosphors

Wave-Length Dependence of the Quantum Efficiency and Absorption of Powder Phosphors

Sensitized Luminescence of CaF[sub 2]:(Ce + Mn)

Zur Photochemie von Substitutions‐ und Isomerisierungsreaktionen von Komplexionen des III‐wertigen Chroms

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