The light source and optical system of a quantum efficiency tester require a stable light source, typically covering a wide spectral range from ultraviolet to infrared, to meet the testing needs of different types of optoelectronic devices. The light emitted by the light source is collimated and monochromatized through a series of optical components such as lenses, filters, etc. Filters can selectively allow light of specific wavelengths to pass through, enabling accurate measurement of the quantum efficiency of devices at different wavelengths.

Sample excitation and signal collection: Collimated monochromatic light is irradiated onto the sample of the optoelectronic device to be tested, and photons are absorbed by the sample to generate photo generated carriers (such as electron hole pairs). In photovoltaic devices, these charge carriers will separate and generate photocurrent under the action of the built-in electric field; For light-emitting devices, it is possible to convert electrical energy into photons and emit them. The testing system collects signals such as photocurrent or luminescence intensity through professional electrode connections and optical collection devices. The collection of weak signals will use high-sensitivity current amplifiers or photodetectors to ensure the accuracy and reliability of the signals.

Signal processing and quantum efficiency calculation: The collected electrical or optical signals are input to the computer control system after analog-to-digital conversion. The software calculates based on pre calibrated parameters (such as incident light intensity, wavelength, etc.), combined with the collected sample response signal, according to the definition formula of quantum efficiency. Quantum efficiency is equal to the ratio of the number of generated photoelectrons or output photons to the number of incident photons. By repeating the above testing process at different wavelengths, the quantum efficiency spectrum curve of the optoelectronic device can be obtained, reflecting its photoelectric conversion performance at various wavelengths.

Precautions for using quantum efficiency tester:

1. Safety protection measures

-Personal protective equipment: Protective gloves, masks, and goggles must be worn before operation to prevent direct laser exposure to the eyes or contact with harmful chemicals.

-Environmental isolation: Keep the work area well ventilated and away from flammable materials, especially when dealing with high-power light sources, be alert to the risk of overheating.

2. Key points of equipment maintenance

-Regularly check the hardware status, including issues such as light source brightness attenuation, monochromator resolution changes, and detector sensitivity drift, and promptly calibrate or replace aging components.

-Cleaning and maintenance: Clean the residue on the sample stage after each experiment to avoid the accumulation of pollutants that may affect the accuracy of subsequent tests.

3. Environmental control requirements

-Darkroom operation: All tests should be conducted in a darkroom without ambient light interference, and if necessary, a light shield should be used to further shield external light.

-Temperature and humidity management: Strictly control the temperature fluctuation range in the laboratory, and keep the humidity at an appropriate level to prevent condensation from causing circuit short circuits or corrosion of components.

4. Suggestions for operating standards

-Familiarize yourself with the manual: Carefully read the user manual before initial use to understand the instrument's functional limitations and special operating modes.

-Standardization process: Establish a unified testing protocol, including preprocessing steps, parameter setting sequence, and exception handling plan, to ensure comparability of data from different batches.