Probing a new approach for warm white light generation in lanthanide doped nanophosphors

Dalton Transactions : an International Journal of Inorganic Chemistry
M RaiS B Rai

Abstract

Lanthanides are among the most acceptable activator ions for cool white light emission; however, solid state lighting for some applications requires a warm white light. Herein, the present work probes a new approach for color temperature tuning in such systems to get a warm white light. The idea is that the additional use of red spectral components in cool white light, to a certain extent, may lead to a perfect warm white light, which can be achieved by making use of the surface oxygen defects mediated red emission from ZnO. To realize this noble concept, white light was initially produced in Y(1.993)Dy(0.001)Tm(0.006)O3 and then further ZnO was added. The study includes detailed structural and optical (steady state and time domain) characterization, chromaticity coordinates (CIE) calculation and correlated color temperature (CCT) analysis. The results show that, initially, at low ZnO concentration, Zn(2+) ions prefer to go into the interstitial sites, due to the mismatch of ionic radius between Y(3+) (0.90 Å) and Zn(2+) (0.75 Å). However, beyond a 10 mol% concentration of ZnO, the solubility limit of Zn(2+) ions in the Y2O3 matrix is reached, which results in the development of a Y2O3-ZnO composite. The presence of the ZnO pha...Continue Reading

References

May 7, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Feng GuDuo Rong Yuan
Apr 8, 2009·Angewandte Chemie·Henning A Höppe
Aug 21, 2012·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Monika RaiS B Rai
Dec 19, 2013·Chemical Society Reviews·Mengmeng ShangJun Lin
Jun 2, 2011·The Journal of Physical Chemistry Letters·Chun Che Lin, Ru-Shi Liu

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Citations

Aug 18, 2017·Physical Chemistry Chemical Physics : PCCP·Sagnik DasMrinal Pal

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