Saturation of  ( Zn , Cd )  S  : Cu , Al Cathodoluminescent Phosphors at High Current Densities: I . Experimental Phenomena

McColl, James R.

doi:10.1149/1.2124203

Cited by 19 publications

(8 citation statements)

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“…The radiant, or energy, efficiency of ZnS:Ag under low density CR excitation is high, about 20%. However, it is well-known that ZnS:Ag phosphors exhibit strong sublinearity of the luminescence; the radiant efficiency strongly decreases with increasing excitation density (1,2). At peak current densities in present projection CRT's the efficiency of ZnS:Ag decreases about an order of magnitude.…”

mentioning

confidence: 80%

Blue Emitting Phosphors for Projection Cathode Ray Tubes: and

Leeuw

Mutsaers

Mulder

et al. 1988

J. Electrochem. Soc.

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Substitution of yttrium or gadolinium for lanthanum in normalLaOBr:normalCe leads to efficient blue‐emitting false(normalLa,Yfalse)normalOBr:normalCe and false(normalLa,normalGdfalse)normalOBr:normalCe phosphors. Energy efficiencies under cathode ray excitation of 11% have been realized for phosphors with emission colors comparable with that of normalZnS:normalAg . The optimum preparation procedure consists in firing cerium‐activated oxalates in a flowing atmosphere containing bromine at 1100°C. Thermal quenching and linearity of the luminescence have been investigated. The hygroscopicity should pose no problems in screen manufacturing. Application of La0.6Y0.4normalOBr:normalCe and especially La0.7Gd0.3normalOBr:normalCe could lead to a significant increase in the brightness of projection television systems.

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mentioning

confidence: 80%

Blue Emitting Phosphors for Projection Cathode Ray Tubes: and

Leeuw

Mutsaers

Mulder

et al. 1988

J. Electrochem. Soc.

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“…Furthermore, in the display area, FEDs have been the hopeful technologies for next-generation flat panel displays due to their outstanding performances, such as self-emission, quick response, wide viewing angle, thin panel thickness, low power consumption, and distortion-free images. ,, As an important part of FEDs, the phosphor must have high efficiency and perfect stability under high current densities (10–100 μA/cm 2 ) and low excitation voltage (≤5 kV) in practical applications. , On the basis of these requirements, many sulfur compounds have been developed for FEDs such as ZnS:Ag,Cl, Gd 2 O 2 S:Tb 3+ , Y 2 O 2 S:Tb 3+ /Eu 3+ , , Zn(Cd)S:Cu,Al, and SrGa 2 S 4 :Tb 3+ . However, their good performance in luminescence cannot cover their disadvantages.…”

Section: Introductionmentioning

confidence: 99%

“…4,14,15 As an important part of FEDs, the phosphor must have high efficiency and perfect stability under high current densities (10−100 μA/ cm 2 ) and low excitation voltage (≤5 kV) in practical applications. 16,17 On the basis of these requirements, many sulfur compounds have been developed for FEDs such as ZnS:Ag,Cl, 18 Gd 2 O 2 S:Tb 3+ , 19 Y 2 O 2 S:Tb 3+ /Eu 3+ , 19,20 Zn(Cd)-S:Cu,Al, 21 and SrGa 2 S 4 :Tb 3+ . 22 However, their good performance in luminescence cannot cover their disadvantages.…”

Section: ■ Introductionmentioning

confidence: 99%

Sr₂LiScB₄O₁₀:Ce³⁺/Tb³⁺: A Green-Emitting Phosphor with High Energy Transfer Efficiency and Stability for LEDs and FEDs

Chen

Wang

2019

Inorg. Chem.

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Exploring new, efficient, and stable phosphors is important and meaningful work for both LEDs and FEDs. Here, the new Ce 3+ /Tb 3+ -codoped green-emitting phosphor Sr 2 LiScB 4 O 10 with high energy transfer efficiency and outstanding stability was designed and prepared by a solid-state reaction. The phosphors show a broad excitation spectrum in the range of 235−375 nm and a narrow green emission spectrum around 544 nm. The strong Tb 3+ emission with weak Ce 3+ emission and the decreasing lifetime of Ce 3+ indicate that the samples have high energy transfer efficiency up to more than 90%. The green emission intensity at 250 °C can keep 75% of its intensity at room temperature with changeless color coordinates, which reveals that the phosphors have excellent thermal stability and color stability. The CL performance indicates that the phosphor possesses high saturation current and saturation voltage with good color stability, and a related luminescence mechanism was proposed to explain the remarkable CL properties. On the basis of the outstanding luminescence performance and thermal and color stability in PL and CL, the phosphor shows promise for applications in LEDs and FEDs.

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“…As the external radiant efficiency of ZnS:Ag is about 0.24, the value found for the white-D capability is as high as 251 lm/W. However, the luminescence intensity of ZnS:Ag increases very sublinearly with increasing excitation densities (1,2). At peak current densities the efficiency is lower by an order of magnitude (3).…”

Section: Chromaticity and White-d Capability Of Blue Emitting Phosphorsmentioning

confidence: 92%

“…The radiant, or energy, efficiency of this phosphor is high at low current densities, about 24%. However, the luminescence of ZnS:Ag exhibits a strong sublinear behavior as a function of current density, the efficiency decreases with increasing excitation density (1,2). At peak current densities the efficiency is lower by an order of magnitude (3).…”

mentioning

confidence: 99%

Projection Cathode‐Ray Tubes Comprising Blue Emitting Phosphors with Interference Filters

Klaassen

Leeuw

Mutsaers

1989

J. Electrochem. Soc.

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Multilayer interference filters enhance the luminance, emitted in the forward direction, of cathode-ray tubes used for projection television. These filters also affect the chromaticity of the emitted light. Both effects are calculated from first principles. Using these calculation methods, it is found that by the use of multilayer interference filters, the chromaticity of practically all blue emitting phosphors can be brought within the E.B.U. recommendations for the blue primary. Moreover, this change in chromaticity can be achieved without any loss in white-D capability.A color projection television (PTV) system comprises three cathode-ray (CR) tubes emitting green, red, and blue light, respectively. This light is mixed to produce a colored image at the projection screen. The phosPhor Y203:Eu 3+ is used as the red primary, while as a green primary a Tb3+-activated phosphor such as Y3A150~2:Tb 3+, Y3(A1, Ga)5012:Tb 3+, Y2SiOs:Tb 3 § or LaOCI:Tb 3+ is applied.The phosphor ZnS:Ag is widely used as a blue primary. The radiant, or energy, efficiency of this phosphor is high at low current densities, about 24%. However, the luminescence of ZnS:Ag exhibits a strong sublinear behavior as a function of current density, the efficiency decreases with increasing excitation density (1, 2). At peak current densities the efficiency is lower by an order of magnitude (3). Therefore, the maximum attainable white-D luminance of present project television systems is limited by the light output of the blue primary. To improve the brightness of projection television systems other (more linear) blue emitting phosphors have to be applied (3).For the application of alternative blue emitting phosphors two basic questions have to be considered. First, what is the maximum white-D luminance that can be obtained with given red and green primaries? Second, can an acceptable color reproduction be obtained? Apart from these questions, other properties such as sublinearity of the luminescence with increasing excitation density, deterioration of the efficiency under prolonged electron bombardment, thermal quenching at the high operating temperatures, and the decay time of the luminescence should also be taken into account. These topics are not dealt with here.The maximum attainable white-D luminance of PTV systems is proportional to the so-called white-D capability of the blue primary. This figure of merit is defined for a blue emitting phosphor as the luminous efficiency divided by the y-value of the chromaticity of its emission. We show that this white-D capability hardly depends on the emission spectrum of blue emitting phosphors. The color rendering properties of the PTV system, however, do depend on the emission spectrum. The chromaticity of the emission has to fulfill strict requirements. Application of most alternative blue emitting phosphors is hampered by a chromaticity that is not comparable with that of ZnS:Ag. Usually the y-value of the chromaticity is too high. Although the chromaticity could be adjusted by absorbing filters, the ac...

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Saturation of ( Zn , Cd ) S : Cu , Al Cathodoluminescent Phosphors at High Current Densities: I . Experimental Phenomena

Cited by 19 publications

References 0 publications

Blue Emitting Phosphors for Projection Cathode Ray Tubes: and

Blue Emitting Phosphors for Projection Cathode Ray Tubes: and

Sr₂LiScB₄O₁₀:Ce³⁺/Tb³⁺: A Green-Emitting Phosphor with High Energy Transfer Efficiency and Stability for LEDs and FEDs

Projection Cathode‐Ray Tubes Comprising Blue Emitting Phosphors with Interference Filters

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Saturation of ( Zn , Cd ) S : Cu , Al Cathodoluminescent Phosphors at High Current Densities: I . Experimental Phenomena

Cited by 19 publications

References 0 publications

Blue Emitting Phosphors for Projection Cathode Ray Tubes: and

Blue Emitting Phosphors for Projection Cathode Ray Tubes: and

Sr2LiScB4O10:Ce3+/Tb3+: A Green-Emitting Phosphor with High Energy Transfer Efficiency and Stability for LEDs and FEDs

Projection Cathode‐Ray Tubes Comprising Blue Emitting Phosphors with Interference Filters

Contact Info

Product

Resources

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Sr₂LiScB₄O₁₀:Ce³⁺/Tb³⁺: A Green-Emitting Phosphor with High Energy Transfer Efficiency and Stability for LEDs and FEDs