Mechanistic Insight into Energy-Transfer Dynamics and Color Tunability of Na4CaSi3O9:Tb3+,Eu3+ for Warm White LEDs
authors He, J; Yan, C; Huang, MM; Shi, R; Chen, YB; Ling, CD; Liu, ZQ
nationality International
journal CHEMISTRY-A EUROPEAN JOURNAL
author keywords energy transfer; luminescence; luminescence decay dynamics; phosphor; rare earths
keywords LUMINESCENCE PROPERTIES; EU3+; PHOSPHORS; TB3+; PHOTOLUMINESCENCE; SPECTROSCOPY; EUROPIUM; CE3+; SM3+
abstract In this work, a latent energy-transfer process in traditional Eu3+,Tb3+-doped phosphors is proposed and a new class of Eu3+,Tb3+-doped Na4CaSi3O9 (NCSO) phosphors is presented which is enabled by luminescence decay dynamics that optimize the electron-transfer energy process. Relative to other Eu3+,Tb3+-doped phosphors, the as-synthesized Eu3+,Tb3+-doped NCSO phosphors show improved large-scale tunable emission color from green to red upon UV excitation, controlled by the Tb3+/Eu3+ doping ratio. Detailed spectroscopic measurements in the vacuum ultraviolet (VUV)/UV/Vis region were used to determine the Eu3+-O2- charge-transfer energy, 4f-5d transition energies, and the energies of 4f excited multiplets of Eu3+ and Tb3+ with different 4f(N) electronic configurations. The Tb3+-> Eu3+ energy-transfer pathway in the co-doped sample was systematically investigated, by employing luminescence decay dynamics analysis to elucidate the relevant energy-transfer mechanism in combination with the appropriate model simulation. To demonstrate their application potential, a prototype white-light-emitting diode (WLED) device was successfully fabricated by using the yellow luminescence NCSO:0.03Tb(3+), 0.05Eu(3+) phosphor with high thermal stability and a BaMgAl10O17:Eu2+ phosphor in combination with a near-UV chip. These findings open up a new avenue to realize and develop multifunctional high-performance phosphors by manipulating the energy-transfer process for practical applications.
publisher WILEY-V C H VERLAG GMBH
issn 0947-6539
isbn 1521-3765
year published 2020
volume 26
issue 25
beginning page 5619
ending page 5628
digital object identifier (doi) 10.1002/chem.201905607
web of science category Chemistry, Multidisciplinary
subject category Chemistry
unique article identifier WOS:000520752700001
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journal impact factor 4.857
5 year journal impact factor 4.636
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