Sitakanta Panda

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Questions related from Sitakanta Panda

How can the quantum efficiency of luminescent material be calculated from their PL and Reflectance spectra?

Hi, I came across the attached journal wherein quantum efficiency of luminescent material has been calculated from their PL and Reflectance spectra as follows: The quantum efficiency of CeO2: x%...

11 November 2019 2,542 3 View

What should be the band gap range of efficient phosphors?

Hi, As we know the band gap as well as luminescence increase with the decrease in particle size. On the other hand, nano-phosphors exhibit better luminescence compared to its bulk ones. What are...

08 August 2019 5,523 4 View

Is only single-phase luminescent phosphors used for LEDs applications?

Hi, Sometimes, we observe secondary phase though very small (say 5-10 %) in PXRD pattern of synthesized luminescent phosphors wchich could be due to the purity (%) of reactants used for synthesis...

07 July 2019 4,422 4 View

How crystallinity and luminescence efficiency are related?

Suppose I have synthesized three phosphors of a particular luminescent species in three hosts. I observed from XRD patterns that crystallinity in the three host are different and luminescence...

07 July 2019 2,314 4 View

How can the refractive index of poly crystalline material be determined from Diffuse Reflectance Spectroscopy data?

I have recorded the DRS in reflectance mode which gives plot of reflectance versus wavelength. The Instrument can convert the reflectance spectra to absorbance spectra which gives plot of...

07 July 2018 6,682 0 View

How to determine the brightness of the luminescent phosphor?

Generally, color rendering index coordinates of the synthesized phosphors are compared with the standard values and shown in the Chromaticity diagram for determination of color purity. However, I...

02 February 2018 7,430 0 View