This study investigated the capability of a mathematical model in estimating the phosphor layer heat transfer of an LED system. The focus was on determining the temperature distribution based on light propagation in the phosphor layer. The mathematical model was built upon past work by Kang et al. and solved numerically with heat generation and transfer incorporated into the model. The model li...

Tb 3+ and Eu 3+ activated Ca5(PO4)Cl phosphors were synthesized by a solid state reaction. From powder X-ray diffraction analysis, Ca5(PO4)Cl with a hexagonal structure was confirmed. The excitation spectra indicate the phosphor can be excited by near ultraviolet (NUV) light, which makes it attractive for white light emitting diode (WLED) applications. When the phosphor was excited by 394 nm li...

A novel blue-emitting Sr3.5Y6.5O2(PO4)1.5SiO4(4.5) :Eu2+ phosphor was synthesized via a solid-state reaction. Powder X-ray diffraction (XRD) analysis demonstrated that the Sr3.5Y6.5O2(PO4)1.5(SiO4)4.5 host had a hexagonal crystal structure in the space group P6(3) /m and unit cell parameters a = 9.418 Å, c = 6.900 Å. The as-prepared phosphor showed a blue emission and all the main emission peak...

A new technique for obtaining energy-variable multicolor cathodoluminescent display screensis presented. This technique employs radio frequency ion plasma sputtering of one thin-film phosphor material over a dissimilar phosphor substrate. The technique employed differs from the old "Penetron" screen inthat the substrate and the secondary phosphor layer are single-crystal materials. This results...

In this paper we report GaN:Eu AC-TDEL devices with high luminance and high efficiency levels obtained through optimized phosphor growth techniques and device structure. The GaN:Eu phosphor is grown using interrupted growth epitaxy (IGETM ). An improved thick dielectric layer for inorganic electroluminescent EL display devices has been achieved through a composite high-κ dielectric sol-gel/powd...

We present magnetization and magnetoresistance data at liquid-helium and liquid-nitrogen temperatures for wire materials commonly used for instrumentation wiring of specimens, sensors, and heaters in cryogenic probes. The magnetic susceptibilities in Systeme International units at 4.2 K were found to be: Manganin 1.25x10(-2), Nichrome 5.6x10(-3), and phosphor bronze -3.3x10(-5), indicating that...

Functionally graded materials (FGMs) are compositionally gradient materials. They can achieve the controlled distribution of the desired characteristics within the same bulk material. We describe a functionally graded (FG) metal-phosphor adapting the concept of the FGM; copper (Cu) is selected as a metal and Cu- and Cl-doped ZnS (ZnS:Cu,Cl) is selected as a phosphor and FG [Cu]-[ZnS:Cu,Cl] is f...

− Plasma display panel(PDP) uses the mixture of inert gases to generate a discharge inside display pixels. Inside of PDP, there exists highly reactive conditions in the gap between two glass panels. Chemical properties of MgO layer and phosphor have been investigated as a function of discharge and thermal process. Impurities such as CO, CO2, OH and H2O in discharge region may deteriorate the ch...

The spectral response, brightness, and outgassing characteristics of new, low-voltage phosphors for application in field emission flat panel displays, are presented. The tested phosphor materials include combustion synthesized powders and thin films prepared by rf diode or magnetron sputtering, laser ablation, and molecular beam epitaxy. These cathodoluminescent materials are tested with e-beam...

Multiple exponential equations have been successfully fitted to experimental long afterglow decay curve data for some phosphor materials by previous researchers. The calculated decay constants in such equations are used to assess the phosphorescence characteristics of an object. This study generates decay constants from experimental test data and from existing literature for comparison. It show...