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Narrow-Band Green-Emitting Sr <sub/>2</sub> MgAl <sub/>22</sub> O <sub/>36</sub> :Mn <sup>2+</sup> Phosphors with Superior Thermal Stability and Wide Color Gamut for Backlighting Display Applications
摘要： The narrow-band emitting phosphors have been extensively investigated in recent years, with the expectation that a wide color gamut of phosphor-converted backlighting device could be fabricated. Due to the weak electric–phonon interaction and low structural relaxation caused by the high rigid crystal structure and symmetric coordination environment, Sr2MgAl22O36:Mn2+ (SMAO:Mn2+) shows a narrow full-width at half-maximum of 26 nm, a high color purity of 81.5%, and a low thermal quenching (82% at 473 K of the initial intensity at 298 K). Using K2SiF6:Mn4+ as the red phosphor, SMAO:Mn2+ as the green one, and GaN-based chip as the blue component, the white light-emitting diode exhibits a National Television Standard Committee value of 127%. All the results demonstrate that the SMAO:Mn2+ phosphor has a promising application in the field of advanced wide-color-gamut backlight display, and the establishment of the relationships between the narrow-band emission and crystal structure can also be applied to design other novel narrow-band phosphors for backlighting technologies.
关键词： color gamut,inorganic phosphors,narrow-band emission,white light-emitting diodes,Sr2MgAl22O36:Mn2+,thermal stability,backlight displays
更新于2025-09-23 15:23:52
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Controllable luminescence in Eu2+-doped Li2Sr2Al(PO4)3 phosphor via tuning the Eu2+ concentration and codoping Ce3+
摘要： In this work, blue-emitting aluminophosphate phosphor, Li2Sr2Al(PO4)3:Eu2+, was prepared by the solid state reaction. The influence of Eu2+ concentration on the excitation and emission characteristics of Li2Sr2Al(PO4)3:Eu2+ has been studied using optical spectroscopy techniques. Upon near UV-light excitation, Li2Sr2Al(PO4)3:Eu2+ generates a blue band peaked at 445 nm, and a violet band centered at 398 nm, which originate from Eu2+ ions occupying two kinds of crystallographic sites: Sr(1)O8 and Sr(2)O9, respectively. The luminescence intensities of Eu1 and Eu2 have the strong dependence on the Eu2+ concentration. The contribution of Eu2+ luminescence from Eu1 becomes dominant with high Eu2+-doping. Li2Sr2Al(PO4)3 doped with high level of Eu2+ exhibits a strong narrow-band blue emission with a full width at half-maximum of about 42 nm. Meanwhile, the Eu2+ emission can be efficiently enhanced by codoping with Ce3+ ions using exclusive excitation into the Eu2+ absorption band. The mechanism of luminescence enhancement caused by Ce3+ ions has been determined. These results indicate that Li2Sr2Al(PO4)3:Eu2+,Ce3+ phosphor might be competitive as a potential blue-emitting phosphor for white LEDs.
关键词： Photoluminescence,Narrow-band emission,Aluminophosphate,Optical materials
更新于2025-09-10 09:29:36