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Related Concept Videos

Photoluminescence: Applications01:14

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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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Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
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Fluorescence and phosphorescence are essential phenomena in fields like analytical chemistry, biological imaging, and materials science, where they detect molecular properties and visualize cellular structures. Understanding the variables that influence these luminescent behaviors is crucial for maximizing accuracy and efficiency in their applications. These variables can broadly be grouped into chemical structure, solvent properties, and external conditions, each playing a distinct role in...
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Fluorescence and Phosphorescence: Instrumentation01:25

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Fluorometers and spectrofluorometers are two types of instruments used for measuring molecular fluorescence. These instruments differ in how they select excitation and emission wavelengths and the type of light sources they utilize. Fluorometers use absorption interference filters to choose excitation and emission wavelengths. The excitation source in a fluorometer is typically a low-pressure mercury vapor lamp that emits intense lines distributed throughout the ultraviolet and visible regions.
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Low-energy Cathodoluminescence for OxyNitride Phosphors
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High-Efficiency Continuous-Luminescence-Controllable Performance and Antithermal Quenching in Bi3+-Activated

Peixin Gao1,2, Qian Li1,2, Cheng Zhou1,2

  • 1School of Chemistry and Materials Science, Hunan Agricultural University, Changsha 410128, P. R. China.

Inorganic Chemistry
|August 11, 2022
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Summary

Novel Bi3+-activated phosphors were developed using chemical substitution for tunable luminescence in phosphor-converted light-emitting diodes (pc-LEDs). These materials exhibit excellent thermal stability and potential for high-quality white light illumination.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Luminescence

Background:

  • Bi3+-activated phosphors are crucial for phosphor-converted light-emitting diode (pc-LED) applications.
  • Tuning luminescence properties of phosphors is essential for advanced lighting solutions.
  • Chemical substitution offers a pathway to modify phosphor characteristics.

Purpose of the Study:

  • To synthesize novel full-spectrum A3BO7:Bi3+ phosphors with tunable luminescence.
  • To investigate the effect of chemical substitution (Gd3+ for La3+, Nb5+ for Sb3+) on luminescence properties.
  • To evaluate the thermal stability and potential applications in pc-LEDs.

Main Methods:

  • Chemical substitution strategy was employed to create A3BO7:Bi3+ phosphors (A = Gd, La; B = Sb, Nb).
  • Photoluminescence (PL) spectra were analyzed to determine luminescence tunability.
  • Temperature-dependent PL measurements were conducted to assess thermal stability.

Main Results:

  • Luminescence was tuned from green (520 nm) to blue (445 nm) by substituting Gd3+ for La3+ in La3SbO7:Bi3+.
  • Solid solutions La3Sb1-xNbxO7:Bi3+ showed tunable luminescence from green (520 nm) to orange-red (592 nm).
  • La3-xGdxSbO7:Bi3+ phosphors demonstrated excellent thermal stability, with intensity remaining >93% at 150 °C.
  • LaGd2SbO7:0.03Bi3+ exhibited remarkable anti-thermal quenching (135.2% at 150 °C).
  • A full-visible spectrum for pc-LEDs with a high color-rendering index (Ra = 94.4) was achieved.

Conclusions:

  • Chemical substitution is an effective strategy for tuning the photoluminescence of Bi3+-activated phosphors.
  • The developed phosphors show significant potential for white-light illumination and accurate plant lighting applications.
  • The study highlights the importance of host lattice engineering for advanced phosphor development.