Dataset Information

Blue-green tunable color of Ce(3+)/Tb(3+) coactivated NaBa3La3Si6O20 phosphor via energy transfer.

ABSTRACT: A series of color tunable phosphors NaBa3La3Si6O20:Ce(3+), Tb(3+) were synthesized via the high-temperature solid-state method. NaBa3La3Si6O20 crystallizes in noncentrosymmetric space group Ama2 with the cell parameters of a?=?14.9226(4) Å, b?=?24.5215(5) Å and c?=?5.6241(2) Å by the Rietveld refinement method. The Ce(3+) ions doped NaBa3La3Si6O20 phosphors have a strong absorption band from 260 to 360?nm and show near ultraviolet emission light centered at 378?nm. The Ce(3+) and Tb(3+) ions coactivated phosphors exhibit color tunable emission light from deep blue to green by adjusting the concentration of the Tb(3+) ions. An energy transfer of Ce(3+)???Tb(3+) investigated by the photoluminescence properties and lifetime decay, is demonstrated to be dipole-quadrupole interaction. These results indicate the NaBa3La3Si6O20:Ce(3+), Tb(3+) phosphors can be considered as potential candidates for blue-green components for white light emitting diodes.

SUBMITTER: Jia Z

PROVIDER: S-EPMC5024107 | biostudies-literature | 2016 Sep

REPOSITORIES: biostudies-literature

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Blue-green tunable color of Ce(3+)/Tb(3+) coactivated NaBa3La3Si6O20 phosphor via energy transfer.

Jia Zhen Z Xia Mingjun M

Scientific reports 20160915

A series of color tunable phosphors NaBa3La3Si6O20:Ce(3+), Tb(3+) were synthesized via the high-temperature solid-state method. NaBa3La3Si6O20 crystallizes in noncentrosymmetric space group Ama2 with the cell parameters of a = 14.9226(4) Å, b = 24.5215(5) Å and c = 5.6241(2) Å by the Rietveld refinement method. The Ce(3+) ions doped NaBa3La3Si6O20 phosphors have a strong absorption band from 260 to 360 nm and show near ultraviolet emission light centered at 378 nm. The Ce(3+) and Tb(3+) ions coa ...[more]

PMID: 27628111

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Project description:Protoporphyrin (PP) and biliverdin (BV) give rise to the enormous diversity in avian egg coloration. Egg color serves several ecological purposes, including post-mating signaling and camouflage. Egg camouflage represents a major character of open-nesting birds which accomplish protection of their unhatched offspring against visually oriented predators by cryptic egg coloration. Cryptic coloration evolved to match the predominant shades of color found in the nesting environment. Such a selection pressure for the evolution of colored or cryptic eggs should be present in all open nesting birds and relatives. Many birds are open-nesting, but protect their eggs by continuous brooding, and thus exhibit no or minimal eggshell pigmentation. Their closest extant relatives, crocodiles, protect their eggs by burial and have unpigmented eggs. This phylogenetic pattern led to the assumption that colored eggs evolved within crown birds. The mosaic evolution of supposedly avian traits in non-avian theropod dinosaurs, however, such as the supposed evolution of partially open nesting behavior in oviraptorids, argues against this long-established theory. Using a double-checking liquid chromatography ESI-Q-TOF mass spectrometry routine, we traced the origin of colored eggs to their non-avian dinosaur ancestors by providing the first record of the avian eggshell pigments protoporphyrin and biliverdin in the eggshells of Late Cretaceous oviraptorid dinosaurs. The eggshell parataxon Macroolithus yaotunensis can be assigned to the oviraptor Heyuannia huangi based on exceptionally preserved, late developmental stage embryo remains. The analyzed eggshells are from three Late Cretaceous fluvial deposits ranging from eastern to southernmost China. Reevaluation of these taphonomic settings, and a consideration of patterns in the porosity of completely preserved eggs support an at least partially open nesting behavior for oviraptorosaurs. Such a nest arrangement corresponds with our reconstruction of blue-green eggs for oviraptors. According to the sexual signaling hypothesis, the reconstructed blue-green eggs support the origin of previously hypothesized avian paternal care in oviraptorid dinosaurs. Preserved dinosaur egg color not only pushes the current limits of the vertebrate molecular and associated soft tissue fossil record, but also provides a perspective on the potential application of this unexplored paleontological resource.

Dataset Information

Blue-green tunable color of Ce(3+)/Tb(3+) coactivated NaBa3La3Si6O20 phosphor via energy transfer.

Publications

Blue-green tunable color of Ce(3+)/Tb(3+) coactivated NaBa3La3Si6O20 phosphor via energy transfer.

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