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Investigate the physical mechanisms driving phosphor saturation and luminescence quenching in Ca5(PO4)3Cl:Eu2+,Mn2+ phosphors under intense excitation in 405-nm LED packages.

February 25, 2008Applied Physics Letters

Eu 2 + – Mn 2 + phosphor saturation in 5mm light emitting diode lamps

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Investigate the physical mechanisms driving phosphor saturation and luminescence quenching in Ca5(PO4)3Cl:Eu2+,Mn2+ phosphors under intense excitation in 405-nm LED packages.
Packaged Ca5(PO4)3Cl:Eu2+,Mn2+ phosphors within 5-mm lamps paired with 405-nm light-emitting diodes.
Measured luminescence efficiency under pulsed excitation and tracked decay dynamics using time-resolved spectroscopy.
Developed a quantitative kinetic model combining Mn2+ ground-state depletion, excited-state Mn2+–Mn2+ interactions, and Eu2+ to excited Mn2+ energy transfer.
Observed a sublinear luminescence response driven by high excitation flux and the intrinsically slow radiative relaxation rate of Mn2+ ions.
Demonstrated that incorporating Eu2+ to excited Mn2+ energy transfer quantitatively accounts for observed efficiency droop under pulsed excitation.
Matched time-resolved luminescence decay profiles across varying excitation intensities using the combined multi-pathway saturation model.

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Implication

Experimental study reveals phosphor saturation mechanisms in 405-nm light-emitting diodes, indicating energy transfer to excited manganese ions limits emission efficiency.

Cite This Study

Setlur et al. (2008) studied this question.

synapsesocial.com/papers/6a75a687ae41e4ffbd6a3701 https://doi.org/10.1063/1.2885093

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Implication

Experimental study reveals phosphor saturation mechanisms in 405-nm light-emitting diodes, indicating energy transfer to excited manganese ions limits emission efficiency.

Eu 2 + – Mn 2 + phosphor saturation in 5mm light emitting diode lamps

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Eu 2 + – Mn 2 + phosphor saturation in 5mm light emitting diode lamps

Key Points

Discussion

Implication

Cite This Study

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