A new integrating sphere design for spectral radiant flux determination of light-emitting diodes

2009 ◽  
Vol 20 (9) ◽  
pp. 095111 ◽  
Author(s):  
P Hanselaer ◽  
A Keppens ◽  
S Forment ◽  
W R Ryckaert ◽  
G Deconinck
Keyword(s):  
Light Emitting Diodes ◽  
Radiant Flux ◽  
Integrating Sphere ◽  
Light Emitting ◽  
Flux Determination

Light source with light emitting diodes. Determination of limited frequencies and of the crest factor of illuminance meters and luminance meters

1989 ◽  
Vol 20 (5) ◽  
pp. 205-217
Author(s):  
J Deforges ◽  
P Garcia ◽  
J Bastie ◽  
F Marandet ◽  
J Bernard ◽  
...  
Keyword(s):  
Light Source ◽  
Light Emitting Diodes ◽  
Crest Factor ◽  
Light Emitting

ACCURATE MEASUREMENT OF ULTRAVIOLET LIGHT-EMITTING DIODES

2021 ◽  
Author(s):  
C. Yuqin Zong ◽  
Cameron Miller
Keyword(s):  
Ultraviolet Light ◽  
Light Emitting Diodes ◽  
Luminous Flux ◽  
Junction Temperature ◽  
Integrating Sphere ◽  
Light Emitting ◽  
Type D ◽  
Uv Led ◽  
Uv Leds ◽  
Ultraviolet Light Emitting Diodes

We have developed a new calibration capability for 200 nm to 400 nm ultraviolet light-emitting diodes (UV LEDs) using a Type D gonio-spectroradiometer. The recently-introduced mean differential continuous pulse (M-DCP) method is used to overcome the measurement difficulty associated with the initial forward voltage, VF, anomaly of a UV LED, which makes it impossible to use VF to infer junction temperature, TJ, during pulsed operation. The new measurement facility was validated indirectly by comparing the measured total luminous flux of a white LED with that measured using the NIST’s 2.5 m absolute integrating sphere. The expanded calibration uncertainty for the total radiant flux is approximately 2 % to 3 % (k = 2) depending the wavelength of the UV LED.

Study of temperature sensitive optical parameters and junction temperature determination of light-emitting diodes

2012 ◽  
Vol 100 (20) ◽  
pp. 202108 ◽  
Author(s):  
Yue Lin ◽  
Yu-Lin Gao ◽  
Yi-Jun Lu ◽  
Li-Hong Zhu ◽  
Yong Zhang ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Junction Temperature ◽  
Temperature Sensitive ◽  
Optical Parameters ◽  
Light Emitting ◽  
Temperature Determination
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