2results about How to "Increase application path" patented technology

The application provides an inorganic scintillation crystal performance test system and method based on an adjustable pinhole collimator, and solves the problem that existing inorganic scintillation crystal performance test systems are mostly limited to the research of specific crystals and radioactive sources and are not universal in radiation detection macroscopic applications. The system comprises a base, a radioactive source, a radioactive source limiting unit, a collimation assembly, a collimation adjusting unit, a detector position adjusting unit and a rear-end test unit. Through the use of the system core structure, the collimation assembly composed of multiple pinhole collimators, the radioactive source radiation is accurately injected into the scintillation crystal at a certain angle, reducing the interference caused by scattering and environmental background, and combining standard scintillation crystals and standard radioactive sources of the same kind, the activity and energy consistency of the radioactive source is calibrated with high precision and sensitivity, and then flexible matching of various types of radioactive sources is realized, and the objective conditions of the numerous radiation isotopes in the application environment are restored as much as possible.

This invention discloses a method for fabricating a quantum dot photodetector with a defect state density gradient distribution, belonging to the field of optoelectronic device technology. This invention introduces nitrogen vacancies and low-valence Ti defects within the quantum dot, utilizing the sub-bandgap energy levels formed by these defects to achieve near-infrared light absorption. A gradient defect distribution is set along the thickness direction of the light-absorbing layer, forming a gradient energy band and a built-in auxiliary electric field, promoting the separation of photogenerated carriers. The high electron concentration quantum dot layer near the electron transport layer can selectively extract electrons and block hole backflow. This invention eliminates the use of toxic lead-based quantum dot materials, resulting in a green and environmentally friendly device that combines excellent infrared response and carrier collection efficiency. The fabrication process is simple and low-cost, facilitating large-scale fabrication and making it suitable for near-infrared photodetector-related fields.