Analysis on the Luminous Efficiency of Phosphor-Conversion White Light-Emitting Diode

Measurement and numerical studies of optical properties of YAG:Ce phosphor for white light-emitting diode packaging.

The optical properties of YAG:Ce phosphor were measured by a double-integrating-sphere system and calculated by Mie theory and Monte Carlo ray tracing to provide precise optical characterizations of YAG:Ce phosphor for white light-emitting diode (LED) packaging design. Measurement results showed that the phosphor presents strong absorption for blue light, high reflection for yellow light, and a...

Luminescent Properties of Calcium Halophosphate Phosphor for White Light Emitting Diode

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...

Phosphor-Based White Light Emitting Diode (LED) for Vertical Scanning Interferometry (VSI)

White Light-Emitting Diode Lamps Using Oxynitride and Nitride Phosphor Materials

White-light emitting diode lamps for general illumination can be realized by a combination of a blue light-emitting diode semiconductor die and phosphors. Newly developed oxynitride and nitride phosphors are promising candidates for this application because they have suitable excitation and emission wavelengths and stable optical properties in a high temperature environment. High brightness war...

Spectral power distribution deconvolution scheme for phosphor-converted white light-emitting diode using multiple Gaussian functions.

We propose a procedure to deconvolute the spectral power distribution (SPD) of phosphor-converted LEDs (pc-LEDs). The procedure involves a two-step process using multiple Gaussian functions. The first step is a preliminary process to deconvolute an SPD using a pair of Gaussian functions. Using the results from the first step, the second step determines (a) the number of Gaussian functions to be...