The document discusses photoluminescence (PL), which is the emission of light from a material after absorbing photons, and outlines its introduction, instrumentation, working principles, applications, limitations, and conclusion. PL has applications in areas such as material characterization, biological imaging, and solar energy research, but also faces limitations like surface sensitivity and low signal intensity. Overall, PL spectroscopy is highlighted as a versatile analytical technique valuable in material science and optoelectronics.

1. PHOTOLUMINESCENCE
by Shikha Pathak

2. Content :-
 Introduction
 Instrumentation
 Working
 Application
 Limitation
 Conclusion

3. Introduction:-
 Luminescence is the emission of light from
a substance that is not heated, and is also
known as "cold light".
 It can be caused by chemical or enzymatic
reactions, and can be either a flash or a glow
 Photoluminescence (PL) is the emission
of light from a material after it absorbs
photons (light).This process begins with
photo excitation, where photons excite
electrons to a higher energy level

4. Instrumentation :-
fig ;- Working of pl

5. Working /principle :-

6. Working :-

7. Application :-
Photoluminescence (PL) spectroscopy has
several important applications across various
fields:
 Material Characterization
 Biological Imaging:
 Solar Energy Research
 Quantum Dots
 Defect Analysis in Semiconductors
 Optoelectronic Devices:
 Environmental Monitoring

8. limitations
 Surface Sensitivity
 Low Signal Intensity
 Temperature Dependence
 Complex Spectra
 Excitation Source Limitations
 Non-Radioactive Recombination
 Sample Preparation

9. Conclusion
 In conclusion, photoluminescence (PL)
spectroscopy is a powerful and versatile
analytical technique widely used in
material science, biology, and
optoelectronics.
 It provides valuable insights into the
electronic properties and structural
characteristics of various materials.

10. Thank
you