Structure Determination and Luminescent Property Studies of the Single Crystal Na3Sm(BO3)2

Dan Zhao,Jian Wang,Lei Zhang,Cong-Kui Nie,Yunchang Fan,Fa-Xue Ma

doi:10.3390/cryst7050129

Dan Zhao, Jian Wang + Show 4 more

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https://doi.org/10.3390/cryst7050129

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Journal: Crystals	Publication Date: May 5, 2017
Citations: 10	License type: CC BY 4.0

Affiliation: Henan Polytechnic University

Abstract

Sodium samarium borate Na3Sm(BO3)2, was prepared by a flux method and structurally characterized by single-crystal structure analysis for the first time. The results show that it crystallizes in the monoclinic system P21/n, with a = 6.5667(3) Å, b = 8.7675(4) Å, c = 10.1850(5), β = 90.86°, V = 586.32(5) Å3 and Z = 4. The structure contains NaO7, NaO6, NaO5, SmO8, and BO3 units, which are interconnected via corner- or edge-sharing O atoms into a three-dimensional structure. The excitation spectra, emission spectra, decay time, and Commission International de l’Éclairage (CIE) chromaticity index of Na3Sm(BO3)2 were studied. Under near light excitation (406 nm), the powdered Na3Sm(BO3)2 shows the orange-red emission, which originates from the 4G5/2→6H9/2 and 4G5/2→6H7/2 transformation of Sm3+ ion.

Highlights

In recent years, developing new luminescent materials has become a hot topic for new lighting and display technology such as phosphor-converted white light emitting diodes (LED) because of their excellent advantages of eco-friendliness, high efficiency, high power efficiency, long lifetime, and low cost [1,2,3]
single-crystal X-ray diffraction (SC-XRD) analysis reveals that the compound Na3Sm(BO3)2 crystallizes in the Monoclinic system analysis reveals that the compound crystallizes in unique the Monoclinic
A new type of sodium samarium borate Na3 Sm(BO3 )2 was prepared using a high temperature molten molten salt method and its structure was determined by SC-XRD analyses

Summary

Introduction

In recent years, developing new luminescent materials has become a hot topic for new lighting and display technology such as phosphor-converted white light emitting diodes (LED) because of their excellent advantages of eco-friendliness, high efficiency, high power efficiency, long lifetime, and low cost [1,2,3]. LED chip with a yellow phosphor (Y3 Al5 O12 : Ce3+ ), which blends the blue light from the chip and yellow light from the phosphor resulting in white light. This kind of white LED has the poor color rendering index and high Correlated Color Temperature (CCT) for the lack of red component. Another way is to directly use a near-ultraviolet (NUV) LED to excite red, green, and blue (RGB). A large amount of research work has been devoted to explore new phosphors in various host materials with high performance, good stability, and preparation [4,5]

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