A high color purity red emitting phosphor CaYAlO4:Mn4+ for LEDs

Abstract

An intense red phosphor, CaYAlO 4 :Mn 4+ , was developed by solid state reaction. The photoluminescence excitation and emission spectra, concentration effect, thermal-dependent luminescence quenching properties and decay curves are investigated. The results show Mn 4+ ion exhibits a broadband excitation extending from 250 to 550 nm and emits an intense red light at 710 nm with high color purity and stable chromaticity coordinates. These results demonstrate that Mn 4+ ion can play a role of activator in narrow red emitting phosphor potentially useful in UV (~370 nm) GaN-base or Blue (~460 nm) InGaN-base LED.

Enhancing photoluminescence properties of Mn4+‐activated Sr4−xBaxAl14O25 red phosphors for plant cultivation LEDs

“…Therefore, the fluoride phosphors are not suitable for the plant growth LED. According to previous reports, the AlO 6 octahedral is suited to the Mn 4+ activator deposit that exhibit strong red emission . For instance, the phenomenon also be found in these phosphors of Ca 14 Al 10 Zn 6 O 35 :Mn 4+ , Ca 3 Al 4 ZnO 10 :Mn 4+ , SrLaAlO 4 :Mn 4+ , CaGdAlO 4 :Mn 4+ , Y 3 Al 5 O 12 :Mn 4+ , and CaYAlO 4 :Mn 4+ phosphors.…”

“…According to previous reports, the AlO 6 octahedral is suited to the Mn 4+ activator deposit that exhibit strong red emission . For instance, the phenomenon also be found in these phosphors of Ca 14 Al 10 Zn 6 O 35 :Mn 4+ , Ca 3 Al 4 ZnO 10 :Mn 4+ , SrLaAlO 4 :Mn 4+ , CaGdAlO 4 :Mn 4+ , Y 3 Al 5 O 12 :Mn 4+ , and CaYAlO 4 :Mn 4+ phosphors. Comprehensively presented above, the Mn 4+ ‐activated aluminate phosphors are developed because of their excellent properties of environmental friendliness, simple preparation process, low price, and good stability.…”

Tuning Mn4+ Red Photoluminescence in (K,Rb)2Ge4O9:Mn4+ Solid Solutions by Partial Alkali Substitution

“…In contrast, oxide phosphors generally provide significantly higher chemical stability and, at the same time, comparably simple and environmentally benign preparation procedures. In consequence, several studies have been focusing on aluminates as hosts for Mn 4+ . Besides aluminates, there has been some research activity on Mn 4+ ‐doped germanate phosphors, in which the Ge 4+ site can more readily be replaced by Mn 4+ than the Al 3+ site (with radii R Al3+ = 0.535 Å, R Ge4+ = R Mn4+ = 0.53 Å) .…”

Photoluminescence properties and energy transfer of novel red phosphor Sr3P4O13:Eu3+, Bi3+

“…It is well known that white light emitting diodes (WLEDs) have attracted much attention due to its advantages of significant power saving, long lifetime, high luminous efficiency, and environmental friendliness [1,2]. At present, WLEDs have been used widely as next-generation solid state lighting in many fields such as traffic signals, mobile phones, and daily life etc [3,4].…”