Measurement device and measurement method of fluorescence quantum efficiency of half integrating spheres

Abstract

The invention discloses a measurement device and a measurement method of the fluorescence quantum efficiency of half integrating spheres. The measurement device comprises a constant-current and constant-pressure source, a patch LED light source, a half integrating sphere optical cavity, an optical fiber spectrometer and a computer, wherein the constant-current and constant-pressure source is used for supplying stable current to the LED light source; the half integrating sphere optical cavity is surrounded by a half integrating sphere shell and a half integrating sphere reflector with the high reflectivity; the inner wall of the half integrating sphere shell is coated by a diffuse reflection coating with the high reflectivity; the half integrating sphere reflector penetrates through the sphere centers; the plane reflector is provided with a round hole which is used for fixing the patch LED light source and a to-be-detected sample; the to-be-detected sample is arranged on the patch LED light source; and a detection hole is formed in the half integrating sphere shell, and is used for coupling connection of an optical probe of the optical fiber spectrometer. A spectrum signal is detected by virtue of the optical fiber spectrometer; the to-be-detected sample is arranged out of an optical fiber numerical value aperture region to prevent primary direct light from entering a detector; and the use of a baffle plate is avoided, and thus the uniformity of light distribution in the integrating spheres is improved.

Description

technical field [0001] The invention relates to a quantum efficiency measuring device and a measuring method thereof, in particular to a semi-integrating sphere fluorescence quantum efficiency measuring device and a measuring method thereof which take transparent fluorescent materials as measuring objects. Background technique [0002] In recent years, with the rapid development of LED lighting equipment, people pay more and more attention to the research on fluorescent materials. Quantum efficiency, as an important index to evaluate the luminous performance of fluorescent materials, has attracted people's attention. Generally, the quantum efficiency of a fluorescent material is defined as the ratio of the number of photons emitted by the material to the number of photons absorbed by the material. [0003] Fluorescent samples to be measured often have the characteristics of uneven spatial distribution of luminous intensity due to factors such as their internal chemical compo...

AI Technical Summary

Problems solved by technology

In the prior art, the laser is usually used as the excitation light source, and the excitation light is introduced through the small hole opened in the wall of the integrating sphere. This method has the following disadvantages: First, the relative distance between the light source and the sample is relatively long, and the excitation light can be adjusted. The process of irradiating the sample is relatively cumbersome; secondly, opening a light hole on the wall of the integrating sphere makes it easy for internal light to escape from the light hole and is easily disturbed by external light

The disadvantage of this method is that the energy of the excitation light coupled into the integrating sphere through the fiber is relatively weak.

[0004] In addition, in the existing integrating sphere measurement technology, in order to avoid the impact of direct light entering the detector on the measurement results, most of them are equipped with a baffle in front of the detector, but the baffle itself will also participate in the absorption and scattering of light in the integrating sphere , breaking the ideal characteristics of the integrating sphere and reducing the effect of the integrating sphere

Images