What is the spectral properties?

Last Update Time: 2019-01-15 12:09:58

The excitation and emission spectra of the samples were measured on the RF-5301 fluorescence spectrophotometer produced by Japan's Shimadzu Company. The source was 150W xenon lamp with a working voltage of 150V. The tested sample is first loaded into the  powder, the excitation and emission wavelength of the sample can not be determined, so it is necessary to predict the monitoring wavelength. 


This is done by:

The wavelength of 600 nm light red light is set as the monitoring wavelength of the excitation spectrum, then the sample is scanned, the excitation wavelength range of the sample is tested, and the peak excitation wavelength is found. For example, there is an excitation peak of 460 nm in the excitation wavelength, and then the excitation wavelength is set to scan the sample, and the emission spectrum of the sample is measured. If the emission peak of 610 nm is obtained in the emission spectrum, then 610m is used as the monitoring wavelength to test the excitation spectrum of the sample. At this time, the peak value of the excitation spectrum, such as 465m, is the excitation wavelength accurately measured in the experiment. The spectrum obtained by exciting the sample at this wavelength is a more reliable emission spectrum. In the process of the experiment, the setting parameters of the fluorometer are very important. Even for the same sample, if the equipment parameters change, the final results will be quite different.

 

Emission spectrum

 

Under the excitation of a certain wavelength of light, the intensity of the light emitted by the phosphor at different wavelengths; or

The curve of energy distribution with wavelength constitutes emission spectrum. There are usually two kinds of emission spectra of phosphors: bands and lines. The former emits in the fixed wavelength range, the energy distribution shows continuous variation, the latter is a certain wavelength range emission, the energy distribution is not continuous, showing a non-geometric sense of the linear, with varying degrees of width. The emission spectrum depends on the luminous center. Heavy metal ions and transition metal ions are strongly affected by the matrix, and they usually exhibit harmonic band emission. Trivalent thin ions generally exhibit linear emission, and the energy values of each spectral line correspond to the corresponding energy level transitions.


This article is from Allicdata Electronics Limited.