Cryogenic Perovskite Scintillators for Sub-10 Ps Timing
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Solution Overview
Problem
Current scintillators face limitations in achieving a timing resolution below 10 ps due to low light yield and long decay times, with existing perovskite scintillators not meeting the requirements of at least 140000 ph/MeV light yield and 1 ns or shorter decay time, especially at room temperature.
Innovation Solution
Configuring perovskite scintillators to operate at low temperatures using cryogenic cooling systems, encapsulating them to protect against moisture and oxygen, and combining them with high Z scintillators to enhance performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If perovskite scintillators are used to achieve high light yield, then light yield is improved, but decay time becomes longer than 1 ns
Solution Approach 1:
The patent changes the temperature parameter from room temperature to cryogenic temperatures (below 100 K, specifically 20-80 K). This parameter change fundamentally alters the scintillation properties of perovskite materials, enabling both high light yield (exceeding 140,000 photons/MeV) and ultrafast decay times (below 1 ns, with components at 0.1-0.5 ns) to coexist, resolving the contradiction between light yield and decay time.
2Ease of operation
If perovskite scintillators are operated at room temperature, then ease of operation is improved, but timing resolution cannot achieve below 10 ps
Solution Approach 1:
The patent changes the operating temperature parameter to cryogenic ranges (20-80 K). At these temperatures, perovskite scintillators achieve timing resolution below 10 ps (reaching 3-5 ps) due to suppressed thermal phonon population and enhanced radiative recombination rates, while maintaining operational feasibility through cryogenic cooling systems.
Solution Approach 2:
The patent exploits the phase transition behavior of perovskite materials at cryogenic temperatures. The structural phase transition and suppression of thermal vibrations at low temperatures fundamentally change the scintillation dynamics, enabling ultrafast decay and high timing resolution that are unattainable at room temperature.
3Measurement precision
If perovskite scintillators are cooled to low temperature, then timing resolution is improved, but device complexity increases due to cooling systems
Solution Approach 1:
The patent utilizes the phase transition properties of perovskite materials at cryogenic temperatures to achieve superior timing resolution. The phase transition behavior enables ultrafast scintillation decay and high light yield, which compensate for the added complexity of cooling systems by providing performance unattainable at room temperature.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Achieves timing resolution of at most 10 ps with a light yield of at least 140000 ph/MeV and decay time of at most 1 ns, enabling applications in advanced imaging systems like PET scanners and X-ray detectors.
Implementation Method 1
Scintillators detect ionising radiation by converting energy deposited in them to a proportional number of photons
Implementation Method 2
light can be detected from the bulk of the crystal absorber with a response time governed by the probability of radiative decay of excited particles
Implementation Method 3
perovskite scintillators configured to be operated at a low temperature
Data Source
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AI summary
Disclosed embodiments include perovskite scintillators configured to be operated at a low temperature, detectors with perovskite scintillators configured to be operated at a low temperature, scanners with perovskite scintillators configured to be operated at a low temperature, methods of cooling a perovskite scintillator to a low temperature, and methods of configuring a perovskite scintillator to be operated at a low temperature.