Journal
ADVANCED OPTICAL MATERIALS
Volume 7, Issue 9, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.201801677
Keywords
energy transfer; lanthanides; luminescence; narrow-band emission; phosphors
Categories
Funding
- National Key R&D Program of China [2018YFB1107200]
- National Natural Science Foundation of China [51472091, 51772270]
- Open funds of State Key Laboratory of Precision Spectroscopy, East China Normal University
- State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences
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Trivalent terbium (Tb3+)-activated luminescence materials usually show highly efficient green emission with the full width at half maximum of merely 10 nm, but suffer from the unsatisfactory excitable wavelength (<380 nm) as well as the inefficient light absorption. Here, the realization of efficient visible light excitation of Tb3+ is demonstrated in terbium-concentrated garnet Ca2TbHf2Al3O12 (CTHA) by introducing Ce3+ as the sensitizer. Owing to highly efficient energy transfer from Ce3+ to Tb3+, CTHA:Ce3+ combines advantages of the extra narrow green emission of Tb3+ peaking at 544 nm and the efficient broad excitation of Ce3+ covering the short-wavelength visible light from 380 to 450 nm. The color gamut of the prototype white light-emitting diode (LED) by using CTHA:Ce3+ as the green emitter can reach 95% (coverage ratio) of National Television Standards Committee (NTSC) space in Commission Internationale de L'Eclairage (CIE) 1931, indicating its great potential for LED (or laser diode)-based applications.
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