Luminescence properties of A1−xEuxAl12O19 (A=Ca, Sr, Ba)

Characterization of Luminescent Materials with 151Eu Mössbauer Spectroscopy

“…Arakawa et al [95] reported an isomer shift of $-9.7$ mm/s which decreases with increasing size of the alkaline earth atom, a result of the decreased electron density at the Eu nuclei. The isomer shift decreases for increasing Eu concentration.…”

Luminescence properties and energy transfer behavior of colour-tunable white-emitting Sr4Al14O25 phosphors with co-doping of Eu2+, Eu3+ and Mn4+

“…Another feasible method is combining blue, green and red phosphors with a near-ultraviolet (n-UV) chip which emits ultraviolet with the wavelength between 380 nm and 420 nm. [7][8][9] This combination improves the colour rendering performance, but poor chemical stability will be shown as it ages due to the different chemical properties of the three phosphors. Compared with other approaches, studies on the preparation of direct-white-emitting light phosphors have been carried out due to their excellent thermal stability and colour rendering properties.…”

Effect of Ca2+ and Sr2+ alkaline earth ions on luminescence properties of BaAl12O19:Eu nanophosphor

“…Recently, white LEDs fabricated by red/green/ blue tricolor phosphors with near (n)-UV Ga(In)N chips have been considered as the most efficient method because (n)-UV lights almost have little effect on the color quality [6,7]. In the past decade, A 1Àx Eu x Al 12 O 19 (A ¼ Ca, Sr, Ba), compounds were investigated as the host materials of long lasting phosphors by codoping with trivalent rare-earth ions [8]. But, the effect of alkaline earth ions such as Ca and Sr in the above system and its effect on the luminescence behaviour of the materials was not focused by the researchers and hence material is considered as the main attempt in the present investigation.…”