Instantaneous measurement of absolute quantum efficiency (absolute quantum yield). Suitable for measuring powder, solution, solid (film), and thin film samples. By using a multi-channel spectral detector for low light, the stray light in the ultraviolet region is greatly reduced.
Characteristics
High measurement accuracy
• Instantly measurable absolute quantum efficiency (absolute quantum yield)
• Removable re excited fluorescence luminescence
Adopting an integral hemisphere unit, a bright optical system has been achieved
• Adopting a multi-channel spectral detector for low light, greatly reducing stray light in the ultraviolet region
Simple operation
Professional software, easy to operate
Easy loading and unloading of sample measurement cells
• Small design, space saving
By using a splitter type excitation light source, any wavelength can be selected
• The software can specify the wavelength of the excitation wavelength and the value of the step for automatic measurement
Multi functional
• Can be used for measuring powder, solution, solid (film), and thin film samples
• Rich parsing functions
Measurement project
Quantum efficiency (quantum yield) measurement
• Excitation wavelength dependence measurement
• Luminescence spectroscopy measurement
PL excitation spectroscopy measurement
EEM (Excitation Emission Matrix) measurement
Purpose:
• LED、 Measurement of Quantum Efficiency (Quantum Yield) of Organic EL Fluorescent Materials
Measurement of Quantum Efficiency (Quantum Yield) of Transmitting Fluorescence and Reflecting Fluorescence in Film like Samples
-Fluorescent samples for non-contact phosphors, etc
Fluorescence measurement of quantum dots, fluorescent probes, biological fields, encapsulated compounds, etc
Quantum efficiency (quantum yield) measurement of dye-sensitized solar cells
• Measurement of complex compounds
Reasons for high precision
1. Ideal optical system for integrating hemispheres
The QE-2000 is equipped with an integral hemisphere. Compared with the integral sphere (global), the integral hemisphere has the following characteristics
Non luminous parts (such as handles) can be isolated from the outside, effectively controlling self absorption and achieving an ideal optical system.
By using a mirror, the luminous intensity of the same measuring point can be increased by about 2 times, and the measured sensitivity is good
Easy loading and unloading of sample measurement cells, with minimal risk of scratching the inside of the integrating sphere
2. Observe the "true physical property value" based on the re excitation fluorescence correction function
Including the re excited fluorescence emission state, not only can the physical properties of the material itself be observed, but also the characteristics of the device cannot be observed, and the true physical property values cannot be obtained. QE-2000 can easily measure the true physical property values with high accuracy by utilizing the characteristic of re excitation fluorescence correction of the integral hemisphere.
3. Reduce stray light in the ultraviolet region through a multi-channel low light splitter detector
Previous detectors (polychromators) were not suitable for measuring quantum efficiency (quantum yield) due to the high level of stray light detected in the ultraviolet region. Otsuka Electronics has developed a technology to remove stray light, which has also solved this problem. The multi-channel spectral detector installed on QE-2000 has a stray light intensity of about 1/5 compared to our previous products, and even in the ultraviolet region, the measurement accuracy is very high.
Specification and style
|
Multi channel spectrophotometer for reducing stray light |
wavelength range |
250nm~800nm (according to spectrometer specifications) |
Spectral analyzer element |
Holographic imaging grating F=3 f=135 mm |
Wavelength accuracy |
±0.3 nm |
Photosensitive element |
Electronic cooled CCD image sensor |
Analysis capability of photosensitive components |
1.2nm / pixel |
Light receiving fiber |
Quartz fiber optic, outer layer technology coating, fixed diameter of φ 12 mm |
|
Excitation light source system |
Excitation light source kit |
150W Xe lamp+spectral grating |
Excitation wavelength range |
250nm ~ 700nm |
Wavelength scanning method |
Sine Bar Sine Bar Method |
|
other |
Integral Hemisphere Device
(HalfMoon) |
φ150 mm |
|
power supply |
power |
700VA |
ACinput |
100V ± 10% 50/60Hz |
Option
• Automatic sampler
• Sample holder
① SUS304 with quartz lid for powder measurement
② Sample holder for membrane measurement and permeation measurement
software
Intuitive and user-friendly professional software. After assembling the sample measurement cell, it is easy to measure quantum efficiency (quantum yield), excitation spectra, etc.
Measurement examples
Measurement of Powder Samples
Measurement Example of Complex Excitation in BAM
When the excitation wavelength changes, the quantum efficiency (quantum yield) will also change accordingly. The excitation wavelength dependence of the quantum efficiency (quantum yield) and reflectivity of BAM (powder) is shown in the following figure. (BAM=BaMgAl10O17: Eu) ● Blue (scale on the left): Internal quantum efficiency after re excitation correction (internal quantum yield) ■ Red (scale on the right): Reflectance at each excitation wavelength According to this graph, in the case of BAM, the closer the excitation light is to the visible area, the lower the yield. That is to say, the reflectivity increases.
Measurement of solution samples
Excitation Spectral Measurement of Fluorescein
The excitation spectrum represents which excitation wavelength has the highest fluorescence intensity in the spectrum. The right figure shows the excitation spectrum of fluorescein (blue) and the fluorescence spectrum at the excitation wavelength with the highest fluorescence intensity (493nm) (green).
Measurement of internal quantum efficiency (internal quantum yield) of fluorescein
The fluorescence spectrum (including excitation light) of fluorescein solution at an excitation wavelength of 493nm is shown in the figure on the right. The internal quantum efficiency (internal quantum yield) can be obtained to be equivalent to 0.903 (concentration 6.43 x 10-6mol/L) and literature value 0.921. 1） G. Weber and F. W. J. Teale, Trans Faraday Soc 53, 646(1957)
Measurement of internal quantum efficiency (internal quantum yield) of quantum dots
Quantum dots have attracted attention as materials that adjust their optical properties by altering their composition and internal structure. The excitation spectrum of quantum dots and the fluorescence spectrum at an excitation wavelength of 370nm are shown in the following figure.
QE-2100
The measuring unit, detection unit, and light source unit are independent. In addition to standard functions, they can also be expanded according to their intended use
Quantum efficiency metering system (separated type) QE-2100
Characteristics
By using temperature control function (50-300 ℃), the temperature dependence of quantum efficiency (quantum yield) can be measured
Construct an optical system based on its intended use, corresponding to various types of samples
Full beam measurement and detection light can also be used for light distribution measurement
The detector can be changed within other wavelength ranges
• Can correspond to wideband (300-1600nm) specifications from ultraviolet to near-infrared
