White light emission from Er2O3 nano-powder excited by infrared radiation

Sevcan Tabanli*, Gonul Eryurek, Baldassare Di Bartolo

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20 Atıf (Scopus)


Phosphors of Er2O3 nano-crystalline powders were synthesized by the thermal decomposition method. The structural properties of the nano-powders were investigated with XRD and HRTEM measurements. The cubic phase with a = 10.540 Å was the only phase observed. The average crystalline sizes and the widths of the grain size distribution curves were determined to be 27.2, 18.7 and 9.7 nm, respectively. The spectroscopic properties of the Er2O3 nano-powder were studied by measuring the luminescence, decay and rise patterns under 808 and 975 nm diode laser excitations. A peculiar effect of the pressure was observed since an optically active ion (Er) is part of the complex and not a dopant. A broad band of the white light emission combined with blue, green and red up-conversion emission bands of Er3+ ions were observed at 0.03 mbar pressure under both excitation wavelengths. Only, an intense broad band white light emission was observed from these nanocrystals at atmospheric pressure. Rising patterns show that the white light intensity reaches its maximum value more rapidly under 975 nm excitation although it decays slower than that of 808 nm excitation. The color quality parameters such as the color coordinate (CRI), correlated color temperature and the color rendering index were found to vary with both the excitation wavelength and the ambient pressure indicating that these nanocrystals could be considered good white light emitting source under the infrared excitations.

Orijinal dilİngilizce
Sayfa (başlangıç-bitiş)207-213
Sayfa sayısı7
DergiOptical Materials
Yayın durumuYayınlandı - 1 Tem 2017

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Publisher Copyright:
© 2017 Elsevier B.V.


This work was supported by Istanbul Technical University Scientific Research Projects Department [ITU BAP, project number 39283]. The author, Sevcan Tabanli, is grateful to The Scientific and Technological Research Council of Turkey for granting a scholarship [TUBITAK, 2211C] for her Ph.D. studies, and is really appreciated to Prof. Baldassare Di Bartolo giving an opportunity to research in his lab.

FinansörlerFinansör numarası
ITU BAP39283
Istanbul Technical University Scientific Research Projects Department
Türkiye Bilimsel ve Teknolojik Araştirma Kurumu

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