Saurabh Chauhan

11 Questions 22 Answers 0 Followers

Questions related from Saurabh Chauhan

How do I avoid scattering while collecting time-resolved photoluminescence (TRPL) spectra of thin films of fluorophores on glass substrate?

I am using time correlated single photon counting (TCSPC) to collect TRPL spectra of quantum dots (QDs). Taking TRPL spectra of solutions is pretty easy in the sense that the excitation passes...

21 January 2016 7,726 0 View

How is diffusion length in organic-inorganic lead halide solar cells calculated?

After reading the first few articles ( stranks et. al and xing et. al), I understood that they use one dimensional diffusion model to fit the carrier population decay rate as, dn/dt = D d2n/dx2 -k...

08 October 2015 5,625 1 View

Can somebody help with steady state emission data of CdSe-QDs+MO2 (M=Ti or Zr) solutions?

I am doing some control experiments with CdSe QDs-MO2 (M=Ti or Zr) colloidal solutions. According to literature, I should see lesser quenching of emission with ZrO2 as compared to TiO2 as the band...

05 February 2015 1,443 0 View

How might one measure background noise for incomplete decays of long lived fluorophores at high rep rate TCSPC experiment?

Hello, I am doing some time resolved emission measurements on CdSe quantum dots using TCSPC. Generally, my samples show multi-exponential decay having 3 or more lifetime compoents. Out of these,...

03 November 2014 5,156 11 View

How can I measure the longer fluorescence lifetime component of quantum dots using TCSPC?

Hello, I am using a Becker and Hickl Tau130 TCSPC system to calculate fluorescence lifetimes of CdSe quantum dots. With me early measurements I have observed that QDs show multi-exponential decay...

24 September 2014 4,755 12 View

Can somebody suggest an ultra short fluorescence lifetime standard which absorbs light at 440 nm?

I am using a Beckr and Hickl Tau 130 TCSPC setup for fluorescence lifetime measurement of different fluorophores. For excitation, I am using a pulsed laser (440 nm). For now, I am using...

27 August 2014 8,545 4 View

Can anybody help with fluorescence decay profile of fluorescein dianion?

I am using Becker and HIckl Tau 130 TCSPC setup to obtain the fluorescence decay profile of various fluorophores. For standardization, I am using Fluorescein dianion as my standard. I am exciting...

28 July 2014 3,222 8 View

Can somebody suggest a standard data analysis software package for time resolved fluorescence experiments for calculation of lifetimes?

I am using a Becker and Hickl Tau 130 - single time correlated photon counting (TCSPC) instrumentation to collect data. Thanks!

16 July 2014 3,977 11 View

Can you help with the fundamentals of reversed start stop operation of TAC (time to amplitude converter) in a TCSPC fluorescence lifetime experiment?

Time resolved fluorescence basically gives us the time taken by an electron to de-excite to the ground state followed by the excitation pulse. And since this process is random in nature we get a...

12 June 2014 4,712 4 View

Can anyone help with measuring IRF (instrument response function) for fluorescence lifetime experiment by TCSPC.

I have been using water to scatter light for measuring IRF of my TCSPC setup. I have also try to use paper. But when I was searching online, I saw that people generally use colloidal silica/ ludox...

09 June 2014 7,728 11 View

Magic angle conditions for fluorescence lifetime experiments by TCSPC - any thoughts?

I am planning to buy 2 Glan Taylor polarizers for my experiment. One for polarizing my laser beam vertically (excitation beam). The other one at 54.7 degrees from the excitation beam polarization....

09 June 2014 1,945 4 View