A red-emitting phosphor and its luminescent properties

Area of Science:

• Materials Science
• Solid-State Chemistry
• Luminescence

Background:

• Rare-earth-doped phosphors are critical for lighting and display technologies.
• Europium (Eu3+) ions are widely used as activators for red emission due to their characteristic sharp emission lines.

Purpose of the Study:

• To synthesize and characterize a novel red-emitting phosphor based on a molybdate-tungstate host doped with Europium.
• To investigate the photoluminescence properties, specifically excitation and emission spectra, of the synthesized material.

Main Methods:

• Solid-state synthesis method was employed to prepare the Li(0.3)Y(0.82)Mo(0.1)W(0.9)O(4+delta): 0.08Eu(3+) (LYMW) phosphor.
• Photoluminescence spectroscopy was used to monitor luminescence under 616 nm excitation and to determine excitation peaks.

Main Results:

• The synthesized LYMW phosphor exhibited excitation peaks at 395 nm, 465 nm, and 535 nm under 616 nm monitoring.
• Excitation peaks in the 250-420 nm range were attributed to O(2-)-->Mo(6+)/W(6+)/Eu(3+) transitions.
• Four sharp peaks corresponding to Eu(3+) 4f-4f transitions (e.g., at ~395 nm from (7)F(0)-->(5)L6) were observed.

Conclusions:

• The solid-state method successfully produced a novel red-emitting phosphor, LYMW.
• The observed excitation peaks confirm the potential of LYMW:Eu(3+) as a red-emitting material for optoelectronic applications.