UV-3600 Plus UV-Vis-NIR Spectrophotometer

High Sensitivity

Shimadzu developed the world’s first UV-VIS-NIR spectrophotometer with three detectors, consisting of a PMT (photomultiplier tube) for the ultraviolet and visible regions and InGaAs and cooled PbS detectors for the near-infrared region. With conventional instruments that use only PMT and PbS detectors, there is a drop in sensitivity in the crossover region between those detectors. Using an InGaAs detector to cover this crossover region, however, ensures high sensitivity across the entire measured wavelength range, and gives a noise level of 0.00003 Abs at 1500 nm.

In addition to the main UV-3600 Plus unit, the Multi-purpose large-sample compartment and the Integrating sphere attachment also feature three detector, enabling the high-sensitivity measurement of solid samples.

High Resolution, Ultra-Low Stray-Light, and Wide Wavelength Range

A high-performance double monochromator makes it possible to attain an ultra-low stray-light level (0.00005 % max. at 340 nm) with a high resolution (maximum resolution: 0.1 nm). The wide wavelength range of 185 to 3,300 nm enables measurement across the ultraviolet, visible, and near-infrared regions.
This instrument can perform spectrophotometry for a variety of applications.

Wide Range of Optional Accessories

The three-detector Multi-purpose large-sample compartment or Integrating sphere options enable high-sensitivity measurement of solid samples. Use the ASR Series of absolute specular reflectance accessories to perform high-accuracy absolute reflectance measurements. In addition, temperature-controlled cell holders and micro cell holders are available to handle a wide range of measurement applications.

The Advantages of Double-Grating Monochromators

Transmittance Measurement of Lenses

Imaging devices, such as mobile phones, digital cameras, and security cameras, are all equipped with lenses. The transmittance of a lens is one factor that determines lens performance. However, because the lens itself focuses light, it is an especially difficult type of sample to measure accurately.

Because of the focal capability of lenses, the total light passing through the spectrophotometer during the measurement of the baseline can be different than that after passing through the lens during measurement due to refraction. In such cases, the use of an integrating sphere can be used to collect all the light passing through the lens and provide for more accurate measurements. In addition, using the transmission-type integrating sphere included with the BIS-603 can reduce measurement errors.

Furthermore, using the V stage, provided as standard on the MPC-603 multi-purpose large-sample compartment, allows measuring the transmittance of lenses of various lengths and sizes. The MPC-603 and BIS-603 are an ideal combination for measuring lenses.

Band Gap Calculation

Research into solar-cell and photocatalytic materials often involves the measurement of the band gap, which is a basic physical property of the materials. Shown below are the diffuse reflectance spectra of three semiconductor materials used in the production of solar cells using the ISR-603 integrating sphere. The absorption edge, the wavelength where the reflectance decreases, differs depending upon the sample type. This difference indicates a difference in the band gap* of the samples.

The band gaps of the samples were calculated using the Tauc method, and were determined to be 1.63ev for GuGaSe2 (red line) 1.27 eV for Culn0.5Ga0.5Se2 (blue line) and 0.99 eV for CuInSe2 (black line).

• The band gap refers to the energy difference between the top of the valence band filled with electrons and the bottom of the conduction band devoid of electrons. The wavelength range of the UV-3600 Plus is extremely effective for band gap calculations.
• The samples are courtesy of the Wada Laboratory, Faculty Science and Technology, Ryukoku University.

Sample	Band Gap Value
CuGaSe2	1.63 eV (757nm)
Culn0.5Ga0.5Se2	1.27 eV (977nm)
CuInSe2	0.99 eV (1253nm)