Journal Article
No Thumbnail Available
License
ClosedAccessClosed Access
 

Energy-Transfer Processes in Nonstoichiometric and Stoichiometric Er3+, Ho3+, Nd3+, Pr3+, and Cr3+ -Codoped Ce:YAG Transparent Ceramics: Toward High-Power and Warm-White Laser Diodes and LEDs

Simple item page
cris.lastimport.scopus2024-02-12T19:50:59Z
dc.abstract.enTransparent light-converting Y3Al5O12:Ce (YAG:Ce) ceramics have become promising materials for advanced light-emitting diode and laser-driven white-light-generation technology. However, their functionality is highly dependent on factors such as structural quality, uniformity of dopant distribution, the presence of defects, and the cost of fabrication. The emission of YAG:Ce ceramics remains thermally stable when high-power-density laser excitation is uniformly spread over the entire surface area of the ceramics due to light-scattering processes. The creation of light-scattering centers that can provide homogeneous white light in ceramics is crucial. One of the drawbacks of YAG:Ce as a material for converting ultraviolet emission into white light is the lack of a red component, which results in cold light and a low color rendering index. Therefore, the codoping of YAG:Ce3+ with red-emitting ions (Er3+, Ho3+, Nd3+, Pr3+, and Cr3+) was carried out and slight nonstoichiometry was induced in the present study to improve the photoconversion parameters. The phase purity of the studied ceramics was analyzed using powder x-ray diffraction and SEM combined with energy-dispersive spectroscopy (EDS). EDS studies revealed that nonstoichiometric ceramics contained Al2O3 phase inclusions that acted as light-scattering centers. Optical transmittance and absorption spectra measurements revealed the presence of light-scattering centers imposed by Al2O3 phase inclusions and nanodefects related to perturbations of the local lattice structure by dopants. EDS mapping and photoluminescence analysis showed the formation of Ce-Ln,Cr (Cr is a transition metal) pairs and the availability of energy transfer between the pair-forming ions. Intrinsic thermal quenching of Ce3+ luminescence started above 400 K. The nonstoichiometric YAG:Ce,Nd sample showed luminescence stability up to 650 K with a luminous efficacy of 198 lm/W. The photoconversion parameters of the transparent ceramic packaged with a blue light-emitting diode or a laser diode were compared. It was shown that the color temperature of ceramic emissions could be controlled by the spectral width of the excitation beam. Thermally stimulated luminescence was applied to investigate the deep trapping centers imposed by the codopants. A detailed EPR study revealed the presence of F+, O−, and Ce4+ centers.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorBUCZYŃSKI, RYSZARD
dc.contributor.authorWzorek, Marek
dc.contributor.authorKucerkova, Romana
dc.contributor.authorJary, Vitezslav
dc.contributor.authorBuryi, Maksym
dc.contributor.authorRomet, Ivo
dc.contributor.authorKirm, Marco
dc.contributor.authorNagirnyi, Vitali
dc.contributor.authorWĘGLARZ, HELENA
dc.contributor.authorGOŁĘBIEWSKI, PRZEMYSŁAW
dc.contributor.authorTomala, Robert
dc.contributor.authorSZYSIAK, AGNIESZKA
dc.contributor.authorBartosiewicz, Karol
dc.date.accessioned2024-01-24T22:47:47Z
dc.date.available2024-01-24T22:47:47Z
dc.date.issued2023
dc.description.financePublikacja bezkosztowa
dc.description.number1
dc.description.volume20
dc.identifier.doi10.1103/PHYSREVAPPLIED.20.014047
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/106179
dc.identifier.weblinkhttps://link.aps.org/article/10.1103/PhysRevApplied.20.014047
dc.languageeng
dc.pbn.affiliationphysical sciences
dc.relation.ispartofPhysical Review Applied
dc.relation.pages014047-1-21
dc.rightsClosedAccess
dc.sciencecloudnosend
dc.titleEnergy-Transfer Processes in Nonstoichiometric and Stoichiometric Er3+, Ho3+, Nd3+, Pr3+, and Cr3+ -Codoped Ce:YAG Transparent Ceramics: Toward High-Power and Warm-White Laser Diodes and LEDs
dc.typeJournalArticle
dspace.entity.typePublication