Absolute PL quantum yield measurement

Absolute PL quantum yield measurement is a method for determining the photoluminescence efficiency of materials.

Absolute PL quantum yield measurement is a method to determine the luminescence efficiency of a material, specifically how efficiently light (energy) absorbed by the material is converted into emitted light. - Since an excitation light source with a spectrometer is used, excitation at various wavelengths (approximately 350 to 800 nm) is possible. ■ Features of MST - The equipment is managed under controlled atmospheric conditions, allowing measurements of thin film samples without the influence of oxygen.

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When light (ultraviolet or visible light) is irradiated onto a substance, the substance may absorb that energy and emit light (photoluminescence, PL). Due to the absorption of light, electrons within molecules that were in a stable energy state (ground state) are temporarily excited to a higher energy state. After undergoing various processes, when the electrons in the singlet excited state return to the stable ground state, they release the difference in energy as light, which is called fluorescence. Furthermore, the light emitted when electrons transition from the triplet excited state back to the ground state is referred to as phosphorescence. This light emission is one of the important intrinsic physical properties of a substance. The photoluminescence quantum yield is a value that indicates how efficiently light emission is obtained relative to the absorbed light (energy). The photoluminescence quantum yield is calculated by measuring the number of photons absorbed by the sample and the number of emitted photons.