Enhancement of optical characteristics of green-emitting single-phase Lu3Al5O12: Ce3+ phosphor using CeO2@B2O3 core–shell for white light generation

Spectral, energy resolution properties and green-yellow LEDs applications of transparent Ce3+:Lu3Al5O12 ceramics

“…The excitation spectra of Ce:LuAG features three wide excitation bands centered at around 227 nm, 350 nm and 450 nm, and the intensity of them increases in sequence. The band centered at 227 nm is ascribed to the electron transition from ground state 4f to 5d sub-band energy level, while, excitation bands centered at 350 nm and 450 nm are ascribed to transition of Ce 3+ ions from the 4f ground states 2 F 5/2 and 2 F 7/2 to the excited 5d 1 levels ( 2 D) [5][6][7]10,11]. It is also noticed that the green-yellow emission spectra consist of a broad band ranging from 500 nm to 700 nm, which resulted from the electron transitions from the lowest crystal-splitting component of 5d 1 excited levels ( 2 D) to the 4f ground state of Ce 3+ ( 2 F 5/2 , 2 F 7/2 ) [5][6][7]10,11].…”

“…Yet, there have not many reports about the energy resolution and decay time of transparent Ce:LuAG ceramics. As mentioned above, when Ce 3+ doped into LuAG crystal, the 5d-4f transitions of Ce 3+ in LuAG host lattice makes Ce:LuAG materials an excellent green-yellow phosphor for white lighting diodes (WLEDs) [10]. The general strategy for producing phosphorconverted WLEDs is to combine blue InGaN-GaN LEDs with the yellow emitting Ce 3+ :YAG phosphor at present [11,12].…”