2D-BCNO with Eu: partial energy transfer and direct natural white light for LEDs

2D-BCNO is a promising candidate as a new phosphor for solid state lighting applications with many advantages, but lacks the emission in the red region of the spectrum much needed for white LEDs. As an attempt to overcome this barrier, BCNO sheets incorporated with red emitting Eu 3+ ions were synth...

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Bibliographic Details
Published in:New journal of chemistry 2019-08, Vol.43 (31), p.12431-12439
Main Authors: Sekar, S, Bhat, S. Venkataprasad
Format: Article
Language:English
Online Access:Get full text
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Summary:2D-BCNO is a promising candidate as a new phosphor for solid state lighting applications with many advantages, but lacks the emission in the red region of the spectrum much needed for white LEDs. As an attempt to overcome this barrier, BCNO sheets incorporated with red emitting Eu 3+ ions were synthesized via a facile combustion method. The broad emission from BCNO in its free form was extended by the addition of sharp red emission from Eu 3+ to generate white light directly under UV excitation. Good quality natural white light emission was achieved with the optimum concentration of Eu 3+ being 0.050.07 mole% and its application for white LEDs was demonstrated. Further studies on the photoluminescence behaviour revealed a partial energy transfer from BCNO to Eu 3+ , which played a major role in generating the white light as illustrated with the help of a modified band level diagram. 2D-BCNO transfers some energy to excite Eu 3+ ions and together they generate white light.
ISSN:1144-0546
1369-9261
DOI:10.1039/c9nj02280e