In the study of material optical properties, temperature is a frequently overlooked yet critically important variable. A semiconductor material may exhibit markedly different spectral responses at different temperatures, and the luminous efficiency of an organic light‑emitting material can also vary significantly with temperature. A temperature‑controlled stage for spectrometers serves as an essential tool, enabling researchers to capture these temperature‑dependent optical phenomena.

How temperature affects the optical properties of materials   “Fingerprint”?

The optical properties of materials are fundamentally linked to molecular motion and electronic transitions, with temperature serving as a key parameter for controlling these microscopic processes. At low temperatures, reduced thermal motion of molecules leads to longer fluorescence lifetimes and a possible redshift of spectral peaks; conversely, elevated temperatures intensify lattice vibrations, increasing the probability of photon scattering and potentially causing a substantial decline in the transmittance of certain materials.

Take vanadium dioxide as an example; this prototypical phase-change material, at around  68 At ℃, an insulator will occur. -  Metallic phase transitions are characterized by dramatic changes in their infrared spectra—shifting from high transmittance at low temperatures to strong reflectance at elevated temperatures. By precisely controlling temperature using a spectrometer equipped with a heating–cooling stage, researchers can clearly capture the spectral signatures of this phase transition, providing essential data for applications such as smart window materials.

In photovoltaic material research, the photoluminescence spectrum of perovskite thin films is highly sensitive to temperature. From…   - 100 °C to 80 Within a temperature range of ℃, the emission peak position, full width at half maximum, and intensity all exhibit systematic variations. These changes directly reflect key parameters such as defect states and carrier lifetimes within the material, and a cryogenic–ambient‑temperature stage for spectrometers is an essential instrument for acquiring this data.

The technical core of the spectrometer’s temperature‑controlled stage: balancing temperature and the optical path.

Achieving precise control of spectral characteristics as a function of temperature is far from straightforward.   “Heating” or “cooling.” A high-performance spectrometer stage capable of both heating and cooling must simultaneously meet multiple technical requirements:

Wide temperature range coverage ： Leveraging the R&D expertise of a specialized technical team, the spectrometer’s temperature‑controlled stage (such as…  TS600C-SM、 TES120N-SM (For certain models) has been achieved from - 190 ℃ (liquid nitrogen cooling) to 600 Wide-temperature control at ℃ can encompass the phase transition and structural transformation ranges of most materials.

Optical compatibility : A well‑designed optical transmission window is required to ensure efficient transmission of light signals across multiple spectral bands, including ultraviolet, visible, and infrared. Our product lineup offers a variety of window materials—such as quartz, calcium fluoride, and potassium bromide—to meet diverse spectroscopic testing requirements.

Temperature control stability : Temperature fluctuations can directly cause drift in spectral signals; therefore, temperature control accuracy must reach   ± 0.1 °C, with a resolution of no less than 0.1 ℃. Chongguang utilizes self-developed temperature-control software ( WinTemp ), which can meet this accuracy requirement and ensure the repeatability of test data.

Environmentally controlled : The optical properties of certain materials are easily affected by the ambient atmosphere; therefore, the heating/cooling stage must support vacuum (≤ 1Pa ) or an inert gas protection function, to prevent oxidation or degradation of the sample under high and low temperatures.

From the Laboratory to Industry: Application Scenarios of Spectrometer Heating and Cooling Stages

The applications of cryogenic and thermal stages for spectrometers have permeated numerous fields, including materials science, energy, and biology.

In Optoelectronic Device R&D In the study, researchers used a hot-and-cold stage to conduct tests.   LED The chip is in - 40 °C to 120 The spectral changes at ℃ are simulated to replicate operating conditions under extreme environments, providing a basis for reliability design in products such as outdoor displays and automotive lighting.

In catalytic materials research, in situ infrared spectroscopy of the catalyst collected at various temperatures enables real-time monitoring of changes in active sites during the reaction, thereby elucidating the catalytic mechanism.   —— For example, in CO In oxidation reactions, 50 °C to 300 Under a temperature gradient of ℃, the changes in the adsorption peaks on the catalyst surface directly reflect shifts in the reaction pathway. Two‑sided window and multi‑faceted window spectrometer with a heating–cooling stage (e.g., …) TS600V-SM ) Supports closed-optical-path testing, making it suitable for this type of research.

Currently, Wuhan Congtical Technology ’s spectrometer temperature‑controlled stages, thanks to…  50  Remaining intellectual property rights (including 30  With technical support from multiple invention patents, it has been deployed at numerous research institutions, including the Lanzhou Institute of Chemical Physics of the Chinese Academy of Sciences and Wuhan University, and has become an essential tool for studying the optical properties of materials. 。

Key Considerations for Selecting a Spectrometer’s Temperature-Controlled Stage

The demand for hot and cold workstations varies significantly across different research settings:

If focusing on Research on Rapid Phase Transitions , the equipment’s heating and cooling rates must be monitored.   —— As TS600 The series can achieve a heating rate of up to 50 °C /min , with a cooling rate of - 30 °C /min , capable of rapidly capturing transient spectral changes.

For Trace Sample Testing , the sample stage dimensions and the design of the light-transmitting aperture are critical, φ 16mm Sample stage paired with φ 2mm The design of the light-transmitting aperture helps reduce background signal interference.

to carry out Multidimensional analysis At that time, you can select models that support electrical probe integration, enabling simultaneous measurement of the sample’s resistance, capacitance, and other parameters while acquiring spectral data, thereby achieving optical…  -  Electricity -  Joint characterization of thermal properties.

Temperature as a means of tuning the optical properties of materials   The “invisible hand” is increasingly recognized as a crucial force by researchers. The spectrometer’s temperature‑controlled stage is not merely a testing tool; it serves as a bridge between macroscopic optical phenomena and microscopic mechanisms. By precisely regulating temperature, researchers can decipher the optical properties of materials under various thermal conditions, and these insights will ultimately drive innovations ranging from next‑generation display technologies to high‑efficiency energy‑storage materials.