Ramesh Vasan

5 Questions 14 Answers 0 Followers

Questions related from Ramesh Vasan

How to convert counts/sec to photon flux or A/W?

I have used a Si CCD detector setup to measure the electroluminescence of a LED. The y axis unit is given as counts/sec. I want to extract the output power density of the LED. Is there a way to...

14 September 2017 2,847 3 View

What could be the reason for a red shift in the PL of CdSe/ZnS core shell nanocrystals mixed with nickel oxide nanoparticles?

I have CdSe/ZnS red emitting nanocrystals in chloroform. The PL peak of these nanocrystals is at 635 nm. When I mix the nanocrystal dispersion with nickel oxide nanoparticle powder and measure...

19 February 2016 662 2 View

Why does the performance of colloidal QD solar cells or LEDs degrade with successive IV measurements?

The performance of colloidal QD solar cells or LEDs degrade with successive IV measurements. Specifically, the resistance of the device drops to few kOhms.

04 March 2014 8,546 5 View

Why does the luminous intensity of a colloidal quantum dot LED degrade with successive IV measurements?

I have fabricated a colloidal quantum dot LED from CdSe/ZnS nanocrystals. The luminous intensity degraded with number of trials. The resistance of the device also reduced from few MOhm to few...

28 February 2014 6,508 3 View

How to avoid short circuits in Quantum dot LED?

I'm fabricating QD LED with a structure, ITO/HTL/QD emission layer/ETL/Ag. I deposit the HTL, QD emission layer and ETL using spin coating. When I deposit the metal contact, it short circuits with...

13 December 2013 767 3 View