Hi there,
I hope you to be healthy.
I'm currently researching deep UV LEDs emitting under 280 nm wavelength and I got some problems these days.
I made two chips and measured their optical properties. Chip 1 has a 10% lower light output power (276 nm peak) than chip 2 (278 nm peak) but in emission images, chip 1 seems to be brighter than chip 2. I checked the emission images using CCD cam connected to an optical microscope.
Here's another problem. When I measure DUV chips, I see the blue-like visible light but there is no peak near 350 - 800 nm in EL spectrum.
I would appreciate it if you let me know your experiences related to these problems.
Dear Su Kyung Kim,
Did you check whether your LED chips emit polarised lights? These could affect your images under an optical microscope since many optical components are involved in the microscope system. It is worth checking whether your microscope has polarisers. The intensities of the images rely on many factors. Therefore, you need to check your light properties from each chip whether it is partial polarised or linear polarised. Hope it helps.
Are you sure that the sensitivity of your sensors is suitable for that wavelength range? And how about the transmission of your optics in DUV?
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