What is excitation spectra?

Excitation spectrum means that under the condition of fixed emission wavelength of phosphor, the excited light source changes incessantly the wavelength of the excited light after the monochromator is separated, and the light of different wavelengths is irradiated to the phosphor after the measurement. The curve of the intensity of the phosphor varies with the excitation wavelength. In the excitation spectrum, the transverse coordinate is a continuous excitation wavelength, which is generally expressed in nanometers (nm), and the vertical coordinate is a fluorescence intensity, which is often described by an arbitrary relative intensity au.

The excitation spectrum characterizes the optimal excitation wavelength needed by the phosphor to produce the effective fluorescence emission. The excitation spectra of the phosphors reflect the response of the phosphors to the extraneous excitation light.

There are three main excitation peaks at 393 nm, 464 mm and 535 nm, respectively. These excitation peaks are narrow band absorption caused by f-f transition of EU. The migration of D is consistent. In addition, the broadband excitation peak on the left side of the excitation spectrum is a charge transfer band. In the excitation spectra of phosphors, the f-f level transition intensity of EU is obviously stronger than that of the charge transfer band. This phenomenon is contrary to the phenomenon that the charge transfer band is stronger than the f-f transition in some materials, which may be related to the electron cloud energy transfer. From the point of view of LED application, phosphors have strong absorption of near ultraviolet and blue light, which matches the wavelength of LED output.

It is suggested that phosphors may be used as phosphors for white LED.

The other is orange-red at 591 nm. The two kinds of light are derived from the D of Eu+, respectively. F _ 2 dipole transition magnetic dipole transition. The intensity of transition in the former is significantly higher than that in the latter, indicating that Eu occupies the position of the inversion center.

From the XRD spectra, we can see that the sample is located in the coordination field with the lattice structure of oblique square system, and the energy level of the sample will be split by the crystal field. Therefore, it is observed that the energy level of the sample belongs to P in the generated spectrum. Splits the energy levels of.

This article is from Allicdata Electronics Limited.