Journal
DALTON TRANSACTIONS
Volume 42, Issue 18, Pages 6327-6336Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3dt32609h
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Funding
- National Natural Science Foundations of China [51002146, 51272242]
- Natural Science Foundations of Beijing [2132050]
- PhD Programs Foundation of Ministry of Education of China [20090022120002]
- Program for New Century Excellent Talents in University of Ministry of Education of China [NCET-12-0950]
- Fundamental Research Funds for the Central Universities [2010ZY35, 2011YYL005]
- Funds of the State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences [RERU2011014]
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A new strategy based on the host composition design has been adopted to obtain efficient color-tunable emission from Ba(2)Ln(0.97-z)Tb(z)(BO3)(2)Cl:0.03Eu (Ln = Y, Gd and Lu, z = 0-0.97) phosphors. This study reveals that the single-phase Ba(2)Ln(1-z)Tbz(BO3)(2)Cl compounds can be applied to use allowed Eu2+ absorption transitions to sensitize Eu3+ emission via the energy transfer Eu2+ -> (Tb3+)(n) -> Eu3+. The powder X-ray diffraction (XRD) and Rietveld refinement analysis shows single-phase Ba(2)Ln(1-z)Tb(z)(BO3)(2)Cl. As-prepared Ba(2)Ln(0.97-z)Tb(z)(BO3)(2)Cl:0.03Eu phosphors show intense green, yellow, orange and red emission under 377 nm near ultraviolet (n-UV) excitation due to a variation in the relative intensities of the Eu2+, Tb3+ and Eu3+ emission depending on the Tb content (z) in the host composition, allowing color tuning. The variation in emission color is explained by energy transfer and has been investigated by photoluminescence and lifetime measurements and is further characterized by the Commission Internationale de l'eclairage (CIE) chromaticity indexes. The quantum efficiencies of the phosphors are high, up to 74%, and show good thermal stabilities up to 150 degrees C. This investigation demonstrates the possibility to sensitize Eu3+ line emission by Eu2+ via energy migration over Tb3+ resulting in efficient color tunable phosphors which are promising for use in solid-state white light-emitting diodes (w-LEDs).
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