1 research outputs found
Single-Photon-Camera-Based Time and Spatially Resolved Electroluminescence Spectroscopy for Micro-LED Analysis
To
investigate the operational mechanisms of micrometer-sized light-emitting
diodes (micro-LEDs), we here demonstrate a transient methodology of
time and spatially resolved electroluminescence spectroscopy (TSR-EL)
to measure the spatial distribution of light emission from LED devices.
By combining a single-photon camera (SPC) with the time-gated sampling
method, we derived the time and spatially resolved electroluminescence
intensity with increasing time. Benefiting from the high sensitivity
of the SPC, this methodology can detect ultralow electroluminescence
(EL) at the delay stage from the device operated around the turn-on
voltage. Furthermore, we investigated the spatial light distribution
of a typical quantum dots light-emitting diode (QLED) under different
applied voltages and varied temperatures. It was found that the EL
emission of the QLED device became more uniform with increasing temperature
and applied voltage. Moreover, the methodology of TSR-EL is versatile
to investigate other LEDs such as organic light-emitting diodes (OLEDs),
micro-LEDs, etc