Comparison of fluorescence properties for single crystal and polycrystalline YAG:Ce

Hollerman, W.A.; Allison, S. W.; Goedeke, S.M.; Boudreaux, Philip; Guidry, R.; Gates, E.

doi:10.1109/tns.2003.814535

Cited by 36 publications

(39 citation statements)

References 7 publications

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“…These results are consistent with earlier TSP research completed during the second year of the NASA-Glenn program [ref. [7][8][9][10][11][12]. As a group, it appears that TSPs made with Zyp binders were better able to withstand slightly higher temperatures compared to the ones made using any of the three tested Cotronics Resbond formulations.…”

Section: Qualitative Resultsmentioning

confidence: 90%

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Study of Resbond ^® Ceramic Binders Used for High Temperature Non‐Contact Thermometry

Goedeke

Hollerman

Bergeron

et al. 2006

Ceramic Transactions Series

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Fluorescence is a good non-contact thermometry technique in hostile environments such as those found at high temperatures. Phosphors are typically rare earth-doped ceramics that emit light when excited. The intensity, rise time, decay time, and wavelength shift of this emitted light can be temperature dependent. When thermographic phosphors are applied to a surface, with an excitation source and a method to characterize the emission provided; it is possible to determine the surface temperature. One of the simpler methods to apply these coating is through the use of temperature sensitive paints (TSPs). These TSPs are created by mixing phosphor with a binder material to form a sprayable coating that can be easily and economically applied to a large area. Ideally, these phosphor paints need to survive at the limit of the existing decay time data, or 1700 °C. The survivability of phosphor paint depends on the physical characteristics of the binder. The goal of this research is to discover binders that will allow phosphor paints to survive at high temperatures. Suitable binders will allow the construction of non-contact measurement devices useful in environments that are not suited for more common thermocouple or infrared devices. For a phosphor paint to be useful at a selected temperature, it must fluoresce when excited and have a measurable decay time. In this study, the Cotronics Resbond ® 791, 792, and 793 ceramic binders were evaluated to determine their suitability to serve as binders for a Y 2 O 3 :Eu phosphor powder. Post-thermal cycling spectral analysis was used to quantify wavelength and intensity changes in emission from ultraviolet excitation. Several of the paints utilizing their binders were able to survive at 1500 °C.

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Section: Qualitative Resultsmentioning

confidence: 90%

“…[1][2][3][4][5][6][7][8][9][10][11][12]. The thermometry method relies on measuring the rate of decay of the fluorescence yield as a function of temperature.…”

Section: Introductionmentioning

confidence: 99%

Study of Resbond ^® Ceramic Binders Used for High Temperature Non‐Contact Thermometry

Goedeke

Hollerman

Bergeron

et al. 2006

Ceramic Transactions Series

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“…An RF magnetron sputtering system was adopted to deposit the ZnGa 2 source target was approximate 2; it was near stoichiometric. Argon and oxygen were used as sputtering gases.…”

Section: Methodsmentioning

confidence: 99%

“…5 shows the CL variations for different phosphor screens with and without annealing at 400 1C. In this plot, a low CL intensity at UV 360 nm was observed when ZnGa 2 O 4 /ITO/glass phosphor screen was non-annealed, whereas, when it was annealed at 400 1C, the emission mechanism of Ga was transferred from 4 T 2B -4 A 2 (360 nm) to 2 ZnO. Hence, the CL peak position was shifted towards the longer wavelength side, at about 490 nm.…”

Section: Article In Pressmentioning

confidence: 98%

“…FED adopts tiny tubes for each pixel and can be built in approximately the same size as liquid crystal display (LCD); some observers believe that FED technology will be the biggest threat to LCD in the FPD arena. However, in order to commercialize FED, improvements need to be made in (1) the electrons emission ability of field emitter array (FEA) and (2) the efficiency of phosphor screen [1][2][3][4][5]. Researchers have investigated several methods to improve the efficiency and luminance of FED, specifically its phosphor screen [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

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Effect of ZnO buffer layer on the cathodoluminescence of ZnGa2O4/ZnO phosphor screen for FED

Yang

Hsueh

Chang

2006

Journal of Crystal Growth

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Single‐Crystal Red Phosphors: Enhanced Optical Efficiency and Improved Chemical Stability for wLEDs

Wang

Yang

Wang

et al. 2019

Advanced Optical Materials

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Crystal phosphors have many unique advantages compared with powdery ones. Herein, room‐temperature‐grown millimeter‐sized single‐crystal phosphors of Cs2XF6:Mn4+ (X = Ge, Si, and Ti) with remarkably higher external quantum efficiency than the corresponding powdery samples are reported. In addition, as compared with the powdery ones, the crystal samples exhibit much better stability toward water under different pH conditions. The red light‐emitting diodes (LEDs) based on Cs2XF6:Mn4+ crystals show significantly improved luminous efficiency than those based on their corresponding powders. An assembled white LED device composed of the two layers of phosphors, i.e., the crystal (such as Cs2GeF6:Mn4+) and commercial Y3Al5O12:Ce3+, on a blue chip exhibits intense warm white light with high luminous efficiency (up to 193 lm W−1), high color rendering indexes (88), and low correlated color temperatures (3107 K). Hence, these crystals with greatly improved efficiency and stability can be potentially applied in high‐quality LED backlighting display and white LED lighting, especially inside the micro‐LED devices.

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Comparison of fluorescence properties for single crystal and polycrystalline YAG:Ce

Cited by 36 publications

References 7 publications

Study of Resbond ^® Ceramic Binders Used for High Temperature Non‐Contact Thermometry

Study of Resbond ^® Ceramic Binders Used for High Temperature Non‐Contact Thermometry

Effect of ZnO buffer layer on the cathodoluminescence of ZnGa2O4/ZnO phosphor screen for FED

Single‐Crystal Red Phosphors: Enhanced Optical Efficiency and Improved Chemical Stability for wLEDs

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Comparison of fluorescence properties for single crystal and polycrystalline YAG:Ce

Cited by 36 publications

References 7 publications

Study of Resbond ® Ceramic Binders Used for High Temperature Non‐Contact Thermometry

Study of Resbond ® Ceramic Binders Used for High Temperature Non‐Contact Thermometry

Effect of ZnO buffer layer on the cathodoluminescence of ZnGa2O4/ZnO phosphor screen for FED

Single‐Crystal Red Phosphors: Enhanced Optical Efficiency and Improved Chemical Stability for wLEDs

Contact Info

Product

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Study of Resbond ^® Ceramic Binders Used for High Temperature Non‐Contact Thermometry

Study of Resbond ^® Ceramic Binders Used for High Temperature Non‐Contact Thermometry