C9920-11Light distribution measurement systems

c9920-11 product photo

Catalog [553 KB/PDF]

The emission of devices like organic LEDs or other light sources varies strongly with the viewing angle. For proper characterization of such samples it is therefore necessary to measure brightness, chromaticity and the emission spectrum for different detection angles. Hamamatsus C9920-11 Brightness Light Distribution Characteristics Measurement meets these needs by using a rotating stage as sample mount and a highly sensitive detector.
The device is mounted on the rotating stage and placed inside a dark sample chamber. It is excited by constant current or voltage.
The electroluminescence is collected by a condensing lens into the light guide. This is connected to the highly sensitive CCD spectrometer which measures instantaneously the whole emission spectrum.
The software measures the emission spectrum for each angle and displays besides each spectrum brightness, angle dependency, I-V-L characteristics and chromaticity.
Furthermore the external quantum efficiency under a Lambertian assumption be calculated, but it can be corrected using the emission angle distribution characteristics.


  • Brightness, emission spectrum and chromaticity are measured in relation to the emission angle.
  • For each step the whole emission spectrum is measured instantaneously by our multi-channel detector.
  • Using a high-performance BT (back thinned) cooled CCD, the system has ultra-high sensitivity.
  • Software controls the constant current power supply.
  • Easy to handle intuitive software for measuring, calculating and controlling the system.
  • Possibility of plotting different variables in several graphs (current, current density, voltage, luminous efficiency, chromaticity, etc.).
  • The system can be easily extended to absolute PL quantum yield measurement and external quantum efficiency measurement systems.

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c9920-11 system configuration

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Two measurement modes

Light distribution measurement

c9920-11 measurement example

Luminous efficiency measurement

c9920-11 measurement example

The luminous efficiency is calculated using the Lambertian assumption. It can be corrected by the emission angle distribution characteristics.

Luminous efficiency of an OLED device. Courtesy of Prof. Kido laboratory,Yamagata University.

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Graph display

Results can be depicted in various graph formats. Current density can be replaced by voltage.

  • Current density / Luminance (cd/m2)
  • Current density / Luminous efficiency (lm/W)
  • Current density / Luminous efficiency (cd/A)
  • Current density / Chromaticity coordinates(x, y)
  • Current density / Voltage
  • Current density / External quantum efficiency
  • Current density / Emission spectrum
  • Time / Chromaticity coordinates (x, y)
  • Time / Emission spectrum
  • Time / Current (voltage)

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Type number  C9920-11 
Rotating stage  Minimum angle setting 1° 
Angle setting range  0 ° to +80 °, -80 ° to +80 ° 
Minimum step setting  1 ° 
Resolution  0.1 ° or less 
Detector  BT (back thinned) cooled CCD 
Cooling temperature (CCD)  -15 ℃ 
No. of photosensitive device channels  1024 ch 
Wavelength measurement range  380 nm to 780 nm (detector: 200 nm to 950 nm) 
Fiber probe  1.5 m 
Measurement spot size  200 μm 
Range for brightness measurements  10 cd/m2 to 10 000 cd/m2 

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