Measurement device of fluorescence quantum efficiency, and measurement method thereof

Abstract

The invention discloses a measurement device of fluorescence quantum efficiency. The measurement device comprises a 1 / 8 integrating sphere, a monochromatic light source system, a spectrograph and a computer, wherein the 1 / 8 integrating sphere is enclosed by a 1 / 8 sphere body and plane mirrors; the inner wall of the 1 / 8 sphere body is coated with a diffuse reflection coating; three surfaces of each plane mirror are vertical to one another and pass through the centre of the sphere; a light inlet is arranged on the plane mirror II; a detection port is arranged on the plane mirror I; exciting light emitted by the monochromatic light source system corresponds to the light inlet; an optical fiber probe of the spectrograph corresponds to the detection port; and the information measured by the spectrograph is input into a computer. The invention also discloses a measurement method of the fluorescence quantum efficiency. By adopting the structure of the 1 / 8 integrating sphere matched with the plane mirrors with three sides, the signal obtained by each point of the spherical surfaces is enhanced to 8 times of that of the complete integrating sphere when the effect of the integrating sphere is ensured; the exciting light or fluorescence also can be prevented from directly entering the spectrograph to generate adverse effects on the measurement result without a baffle plate; meanwhile, a special clamp is not needed in the aspect of sample arrangement; and the uniformity of light distribution in an integral space is improved.

Description

technical field [0001] The invention relates to a fluorescent quantum efficiency measurement device and a measurement method thereof, in particular to a method for measuring the quantum efficiency of fluorescent materials as measurement objects. Background technique [0002] In recent years, with the rapid development of LED lamps, fluorescent lamps, and displays, the research on fluorescent materials has attracted more and more 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] Most of the fluorescent materials used for lighting have the characteristics of uneven spatial distribution of luminous intensity due to factors such as their internal chemical composition and external dimensions. For this reason, the prior art and the measurement devices involved all use integrating spheres to collect the fluorescence emitted from t...

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Problems solved by technology

Usually, the fluorescence from the fluorescent material is very weak, so in order to increase the intensity of the signal detected by the detector, it is better to use an integrating sphere with a smaller diameter. reduce

[0004] In addition, most of the existing integrating spheres are equipped with baffles, which are used to block the fluorescence emitted from fluorescent materials or the excitation light transmitted or reflected on the surface of the materials directly incident on the spectrometer, and the baffles themselves will also participate in the emission of light in the integrating sphere. Absorption and scattering break the ideal characteristics of the integrating sphere, making the distribution of light intensity in the integrating sphere uneven and reducing the accuracy of the measurement results

At the same time, there is also a special fixture in this integrating sphere to fix the sample to be measured at a specific position in the integrating sphere. The special fixture is generally aimed at samples with relatively regular sizes, and it is difficult to apply to samples of different states and shapes; in addition, the fixture The introduction of the sphere further breaks the ideal characteristics of the integrating sphere, making the distribution of light intensity at each point in the sphere uneven

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