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Related Concept Videos

Emission Spectra02:39

Emission Spectra

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When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present.
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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Photoelectric Effect02:26

Photoelectric Effect

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When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Quo vadis, perovskite emitters?

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Halide perovskites are versatile materials for printable optoelectronic devices. Research focuses on understanding photophysical mechanisms to enhance perovskite light-emitting diode (PeLED) efficiency and enable new applications.

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Solid-State Physics

Background:

  • Halide perovskites offer exceptional optoelectronic properties for solution-processed devices.
  • Their applications have rapidly expanded from photovoltaics to light-emitting devices, lasers, and detectors.

Purpose of the Study:

  • To distill photophysical mechanisms for enhancing radiative efficiencies in halide perovskites.
  • To highlight milestones and chart future directions for perovskite optoelectronic devices.

Main Methods:

  • Review and synthesis of existing research on halide perovskite photophysics.
  • Analysis of structure-function relationships in perovskite materials.

Main Results:

  • Perovskite light-emitting device (PeLED) efficiencies have dramatically increased from <1% to >20% in five years.
  • Continuous wave amplified spontaneous emission has been demonstrated in perovskites.

Conclusions:

  • Understanding photophysical mechanisms is crucial for advancing high-efficiency PeLEDs and perovskite lasers.
  • Further research into structure-function relations will streamline development of solid-state PeLEDs.