Skip to content
Skip to content
  • News
  • Events
  • eBooks
  • Blog
  • Careers
  • Contact
  • News
  • Events
  • eBooks
  • Blog
  • Careers
  • Contact
KNOWLEDGEBASE
  • About Us
  • Products

    Fluorescence Spectrometers

    • FLS1000 Photoluminescence Spectrometer
    • FS5 Spectrofluorometer
    • LifeSpec II Lifetime Spectrometer
    • Mini-tau Lifetime Spectrometer

    Raman Microscopes

    • RM5 Raman Microscope
    • RMS1000 Multimodal Confocal Microscope

    Transient Absorption

    • LP980 Transient Absorption Spectrometer

    FTIR Spectrometers

    • IR5 FTIR Spectrometer

    Lasers and LEDs

    • Pulsed Lasers
    • Gas Lasers
    • Customisation Options
    View All Products
  • Techniques
  • Applications
KNOWLEDGEBASE
Edit Content
  • About Us
  • Products
  • Techniques
  • Applications
  • Knowledgebase
  • eBooks
  • News
  • Events
  • Blog
  • Careers
  • Contact Us
  1. Home
  2. Blog Post
  3. Advanced Measurements: Integrating spheres for absorption, reflection, and absolute quantum yield.

BLOG

Advanced Measurements: Integrating spheres for absorption, reflection, and absolute quantum yield.

  • February 1, 2019
Edit Content

The ability to directly measure photophysical properties of new materials, whether in solution or in the solid state, is paramount to understanding their ability to be used in new generation applications and devices. The advent of readily available integrating spheres, especially when coupled to highly sensitive spectrometers, presents the ability for researchers to directly measure the emissive absolute quantum yield, optical absorption, and optical reflection of novel materials and devices.

The SC-30 integrating sphere cassette for the FS5 Spectrofluorometer.

Figure 1: The SC-30 integrating sphere cassette for the FS5 Spectrofluorometer.

Edinburgh Instruments, has designed multiple spheres for each of its photoluminescence spectrometers, the FLS1000 and FS5, that allow the most sensitive measurements over the widest dynamic and wavelength range using single photon counting based detectors and electronics. For ease of use, the integrating sphere is sample-chamber mounted in a matter of seconds, enabling the fast and routine measurement of  traditionally complicated setups. One can even place electrical leads into the integrating sphere for electroluminescent quantum yield and CIE measurements. Additionally, we have designed a temperature controlled integrating sphere, the ‘cryosphere’, which can make absolute quantum yield, optical absorption, and optical reflection measurements on powders, films and crystals from 77 K – 500 K through fiber-optic coupling to our FLS1000 Photoluminescence Spectrometer.

Standard integrating sphere (left) and the temperature controlled Cryosphere (right) for the FLS1000 Photoluminescence Spectrometer.

Figure 2: The standard integrating sphere (left) and the temperature controlled Cryosphere (right) for the FLS1000 Photoluminescence Spectrometer.

The standard FLS1000 and FS5 integrating spheres feature changeable mounts for cuvettes, and trays for powders, crystals, films, and devices. As most solid state materials are not transparent, an integrating sphere is needed to measure the absorption and reflection characteristics of a material, as the sphere can account for every photon in, and every photon being scattered, absorbed, or emitted. There are no standards needed for measuring the absolute quantum yield, as the sphere allows the direct measurement of all photons interacting with a material. A notable example of this work was performed by Prof. Kenneth Hanson at Florida State University, where the absolute quantum yield of solar-cell devices was measured by “Modulating Electron Transfer Dynamics At Dye-Semiconductor Interfaces Via Self-Assembled Bilayers” (Hanson, K. et. al. J. Phys. Chem. C, 2015, 119, 3502. By correlating the absolute quantum yield, the emission lifetimes, and the quenching lifetimes using an FLS Photoluminescence Spectrometer, and the triplet lifetimes and spectra using the Edinburgh Instruments LP980 Transient Absorption Spectrometer, they we able to fully describe the pathways for working and non-working solar-cells.

Solar cell inside an integration sphere.

Figure 3: A solar cell device inside a FLS1000 integration sphere. Hanson, K. et. al. J. Phys. Chem. C, 2015, 119, 3502

The temperature controlled integrating sphere, the ‘cryosphere’, was recently developed by Edinburgh Instruments to probe temperature effects on a material’s quantum yield in the solid state. An example of the cryosphere comes from our own applications team, where we studied the absolute photoluminescent quantum yield (PLQY) of CsPbBr3 perovskites from 77 K – 200 K. We found drastic changes in PLQY with temperature. The PLQY increases from roughly 0.0% at 200 K to 0.4% at 77 K, as at lower temperatures there are less non-radiative pathways and dark-trap sites that are known to limit the emissive qualities.

PLQY of CsPbBr3 perovskites from 77 K – 200 K which were measured with the aid of an integrating sphere

Figure 4: Temperature dependent absolute photoluminescence quantum yield (PLQY) of CsPbBr3 perovskites from 77 K – 200 K

Integrating Sphere for Advanced Measurements

We are pleased to be the world leader in advanced measurements. If you would like to find out how an Edinburgh Instruments integrating sphere can further help your research, we would encourage you to contact our team to ask any questions you may have to propel your research to the highest level possible.

RESOURCES

Tags:
  • FLS1000
  • FS5
  • Photoluminescence
Share:
PrevPrevious
NextNext

Keep up to date with the latest from Edinburgh Instruments

Join our mailing list and keep up with our latest videos, app notes and more!

LOCATION:
  • Edinburgh Instruments Ltd.
    2 Bain Square, Kirkton Campus, Livingston, EH54 7DQ.
  • sales@edinst.com
  • +44 1506 425 300
ABOUT:
  • About Us
  • Techniques
  • Applications
  • Knowledgebase
  • About Us
  • Techniques
  • Applications
  • Knowledgebase
PRODUCTS:
  • Fluorescence Spectrometers
  • Raman Microscopes
  • UV-Vis Spectrophotometers
  • Transient Absorption
  • FTIR Spectrometers
  • Lasers and LEDs
  • Customisation Options
  • Software
  • Upgrades
  • All Products
  • Fluorescence Spectrometers
  • Raman Microscopes
  • UV-Vis Spectrophotometers
  • Transient Absorption
  • FTIR Spectrometers
  • Lasers and LEDs
  • Customisation Options
  • Software
  • Upgrades
  • All Products
LEGALS:
  • News
  • Events
  • Blog
  • Careers
  • Contact Us
  • Terms and Conditions
  • Privacy Policy
  • News
  • Events
  • Blog
  • Careers
  • Contact Us
  • Terms and Conditions
  • Privacy Policy
SOCIALS:
Youtube Linkedin X-twitter Facebook
©2024 Edinburgh Instruments. Registered in England and Wales No: 962331. VAT No: GB 271 7379 37
Manage Consent
To provide the best experiences, we use technologies like cookies to store and/or access device information. Consenting to these technologies will allow us to process data such as browsing behaviour or unique IDs on this site. Not consenting or withdrawing consent, may adversely affect certain features and functions.
Functional Always active
The technical storage or access is strictly necessary for the legitimate purpose of enabling the use of a specific service explicitly requested by the subscriber or user, or for the sole purpose of carrying out the transmission of a communication over an electronic communications network.
Preferences
The technical storage or access is necessary for the legitimate purpose of storing preferences that are not requested by the subscriber or user.
Statistics
The technical storage or access that is used exclusively for statistical purposes. The technical storage or access that is used exclusively for anonymous statistical purposes. Without a subpoena, voluntary compliance on the part of your Internet Service Provider, or additional records from a third party, information stored or retrieved for this purpose alone cannot usually be used to identify you.
Marketing
The technical storage or access is required to create user profiles to send advertising, or to track the user on a website or across several websites for similar marketing purposes.
Manage options Manage services Manage {vendor_count} vendors Read more about these purposes
View preferences
{title} {title} {title}