Quantitative measurement method for absolute photoluminescence quantum efficiency of near infrared quantum shear

Abstract

The invention relates to a quantitative measurement method for the absolute photoluminescence quantum efficiency of near infrared quantum shear, relates to the field of the absolute luminous efficiency measurement of quantum shear materials, and solves the problems that the current measurement method adopting the theoretical quantum efficiency can only relatively evaluate the performance of the quantum shear materials, and the accuracy of measurement is low; as a result, the quantum shear materials cannot be absolutely evaluated. The quantitative measurement method comprises the following steps: putting a standard lamp into an integrating sphere of an integrating sphere detection system, and measuring the luminescence spectrum of the standard lamp to obtain the response function of the integrating sphere detection system; respectively causing laser to radiate into the empty integrating sphere, to radiate into the integrating sphere and not to directly radiate onto a sample and to radiate into the integrating sphere and to directly radiate onto the sample, thus obtaining spectrums of output laser of the integrating sphere and sample fluorescence under the three conditions; calibrating the spectrums of output laser of the integrating sphere and sample fluorescence, converting the calibrated spectrums to photon number distribution spectrums, carrying out integration on the photon number distribution spectrums, and computing to obtain the absolute quantum efficiency eta. The quantitative measurement method is applied to the field of quantitative measurement.

Description

technical field [0001] The invention relates to the field of measurement of absolute luminous efficiency of quantum shear materials. Background technique [0002] Near-infrared quantum shearing materials can realize the modulation of the solar spectrum, converting a photon with a wavelength of less than 550nm into two near-infrared photons with a wavelength of 1000nm, so that the solar spectrum can better match the response of Si-based solar cells, so that Reducing the loss caused by spectral mismatch while obtaining double the photocurrent in the band around 1000nm is expected to improve the efficiency of Si-based solar cells. At present, the theoretically calculated quantum efficiency is generally used to relatively evaluate the quantum shear performance of materials. However, researchers are also aware of a problem. Many factors that inhibit quantum efficiency are ignored in the calculation of theoretical quantum efficiency. The actual quantum efficiency is lower than th...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the existing measurement method using theoretical quantum efficiency can only relatively evaluate the performance of quantum shearing materials, and the measurement accuracy is low, resulting in the inability to achieve absolute evaluation of quantum shearing materials. The present invention provides a Quantitative measurement method of near-infrared quantum shear absolute photoluminescence quantum efficiency

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