Ultraviolet Phosphors and Fluorescent Sun Tan Lamps

Clapp, Richard H.; Ginther, R. J.

doi:10.1364/josa.37.000355

Cited by 31 publications

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“…The previous work 22 suffered from a rising background at the high energy end due to being excited by 450 nm light. However, we agree with the emission band assignments presented previously; 6 these emission bands shown in Figure 4b are at 550 nm (due to 3 P 0 → 3 H 5 ), between 590 nm and 618 nm (due to 1 D 2 → 3 H 4 ) and the very sharp band at 620 nm (in the red due to 3 P 0 → 3 H 6 ) the final emission band seen rising at 650 nm (is due to the 3 P 0 → 3 F 2 transition). The CL spectra of the phosphors illustrated in Figures 4-7 and the PL spectra illustrated in Figure 8 show interesting differences.…”

Section: Resultssupporting

confidence: 93%

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Cathodoluminescence and Photoluminescence of YPO₄:Pr³⁺, Y₂SiO₅:Pr³⁺, YBO₃:Pr³⁺, and YPO₄:Bi³⁺

Broxtermann

Engelsen

Fern

et al. 2017

ECS J. Solid State Sci. Technol.

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Herein we describe the synthesis, characterization, and cathodoluminescence of the UV emitting phosphors YPO 4 :Pr 3+ , Y 2 SiO 5 :Pr 3+ , YBO 3 :Pr 3+ , and YPO 4 :Bi 3+ . These photoluminescent UV phosphors exhibited strong luminescence in the UV part of the electromagnetic spectrum when excited by electron bombardment. Spectra have been recorded between 210 and 650 nm at electron beam energies of 5, 10 and 15 keV. The energy efficiencies of YPO 4 :Pr 3+ , Y 2 SiO 5 :Pr 3+ , YBO 3 :Pr 3+ and YPO 4 :Bi 3+ in the UV range were 9.2%, 2.7%, 5.1%, and 7.2%, respectively at 15 keV. UV photoluminescence measurements were conducted using 160 nm excitation generated by combining a VUV monochromator with a deuterium lamp. The UV emitting phosphor Y 2 SiO 5 :Pr 3+ has attracted attention both because of its potential application as a UV tunable laser and also as a scintillator arising from its short decay time (of about 40 ns).1-4 Moreover, it is one of the first UV emitting materials, which manifests up-conversion of blue radiation into the UV-C range. 5Interest rose in UV-A and UV-B emitting luminescent materials after the introduction of low-pressure Hg discharge lamps that were developed as sun tan lamps in the middle of the 20 th century. 6 The early UV emitting phosphors were activated by Tl + , Pb 2+ , or Bi 3+ , while later Ce 3+ activated phosphors such as LaPO 4 :Ce and YPO 4 :Ce came into play due to their better stability and environmental compliance as they contained no hazardous elements.The development of phosphors emitting in the UV-C range was stimulated by the advent of efficient dielectric barrier Xe discharge lamps some decades ago. [7][8][9] At that time, some UV- have since become less interesting due to the toxic character of these materials. One of the most efficient UV-C emitting materials, which also has a rather high thermal quenching temperature, is YPO 4 :Bi .10 However a serious drawback with this material is the limited stability of Bi 3+ cations toward oxidation or reduction. This necessitated a search for efficient and long-term stable Pr 3+ activated materials, since it is thought that Pr 3+ can withstand the harsh conditions of VUV radiation and the electron bombardment inside an excimer discharge tube. The most efficient materials amongst the many, which have been published so far are YPO 4 :Pr, LaPO 4 :Pr, Y 2 SiO 5 :Pr, YBO 3 :Pr, Ca 9 Y(PO 4 ) 7 :Pr, LuBO 3 :Pr, Lu 2 SiO 5 :Pr and LuPO 4 :Pr. The later Lutetium containing compounds are also regarded as scintillators because of their high density.Xe excimer discharge lamps containing a UV-C phosphor for germicidal action and photochemical purposes have been developed by several groups 11-13 and lamp products containing YPO 4 :Nd, YPO 4 :Pr, YPO 4 :Bi, and LaPO 4 :Pr were introduced several years ago. Even though these lamps can achieve wall plug efficiency close to that of low-and medium-pressure Hg discharge lamps, their commercial success is rather moderate so far. The main reason for this observation is their lower long-term stabi...

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Section: Resultssupporting

confidence: 93%

“…6 The early UV emitting phosphors were activated by Tl + , Pb 2+ , or Bi 3+ , while later Ce 3+ activated phosphors such as LaPO 4 :Ce and YPO 4 :Ce came into play due to their better stability and environmental compliance as they contained no hazardous elements.…”

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confidence: 99%

Cathodoluminescence and Photoluminescence of YPO₄:Pr³⁺, Y₂SiO₅:Pr³⁺, YBO₃:Pr³⁺, and YPO₄:Bi³⁺

Broxtermann

Engelsen

Fern

et al. 2017

ECS J. Solid State Sci. Technol.

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“…For practical applications, emission centers exhibiting allowed excitations are preferable. Therefore, as a candidate, rare earth cations, such as Ce 3+ [2,3] and Eu 2+ [4,5] possessing f-d transition, and ns 2 -type ions, such as Sb 3+ [6,7], Tl + [8,9], and Sn 2+ [10][11][12][13] possessing s-p transition, can be listed [1]. It is notable that these emission centers possess electrons in the outermost shell, the emission properties are strongly affected by the coordination field.…”

Section: Introductionmentioning

confidence: 99%

Photoluminescence of ns2-type center-containing zinc borate glasses

Masai

Yanagida

2016

Journal of Non-Crystalline Solids

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“…In the study, we have focused on the ns 2 -type emission center as an activator. Since the ns 2 -type emission centers (n≧4) possess an electron in the outermost shell in both the ground state (ns 2 ) and the excited state (ns 1 np 1 ), the emission is strongly affected by the coordination field [1,[8][9][10][11]. Therefore, this type of emission center is suitable for amorphous glass, in which site distribution is much broader than that in crystal.…”

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White light emission of Mn-doped SnO-ZnO-P_2O_5 glass containing no rare earth cation

et al. 2011

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The authors have demonstrated white light emission of rare earth (RE)-free Mn-doped SnO-ZnO-P(2)O(5) glass. The RE-free glass shows white light emission with a high value of quantum efficiency (QE) comparable to conventional crystalline phosphor. It is notable that the high QE value is attained for RE-free transparent glass, and the broad emission can be continuously tuned by both the amount of activator and the composition of the glass. Since this glass possesses low-melting property, we emphasize that the glass phosphor will lead to the development of a novel inorganic white-light-emitting device in combination with a solid state UV light-emitting source.

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Ultraviolet Phosphors and Fluorescent Sun Tan Lamps

Cited by 31 publications

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Cathodoluminescence and Photoluminescence of YPO₄:Pr³⁺, Y₂SiO₅:Pr³⁺, YBO₃:Pr³⁺, and YPO₄:Bi³⁺

Cathodoluminescence and Photoluminescence of YPO₄:Pr³⁺, Y₂SiO₅:Pr³⁺, YBO₃:Pr³⁺, and YPO₄:Bi³⁺

Photoluminescence of ns2-type center-containing zinc borate glasses

White light emission of Mn-doped SnO-ZnO-P_2O_5 glass containing no rare earth cation

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Ultraviolet Phosphors and Fluorescent Sun Tan Lamps

Cited by 31 publications

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Cathodoluminescence and Photoluminescence of YPO4:Pr3+, Y2SiO5:Pr3+, YBO3:Pr3+, and YPO4:Bi3+

Cathodoluminescence and Photoluminescence of YPO4:Pr3+, Y2SiO5:Pr3+, YBO3:Pr3+, and YPO4:Bi3+

Photoluminescence of ns2-type center-containing zinc borate glasses

White light emission of Mn-doped SnO-ZnO-P_2O_5 glass containing no rare earth cation

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Cathodoluminescence and Photoluminescence of YPO₄:Pr³⁺, Y₂SiO₅:Pr³⁺, YBO₃:Pr³⁺, and YPO₄:Bi³⁺

Cathodoluminescence and Photoluminescence of YPO₄:Pr³⁺, Y₂SiO₅:Pr³⁺, YBO₃:Pr³⁺, and YPO₄:Bi³⁺