White-Emitting Phosphor Ca[sub 2]BO[sub 3]Cl:Ce[sup 3+], Eu[sup 2+] for UV Light-Emitting Diodes

Abstract

Ce3+ and Eu2+ coactivated normalCa2BnormalO3Cl phosphors exhibit two blue and yellow emission bands under the excitation of UV light. An asymmetric blue emission originates from Ce3+ , whereas the yellow emission originates from Eu2+ . The luminescent mechanism is explained by the resonance-type energy transfer from Ce3+ to Eu2+ , and the energy-transfer efficiency is also calculated by decline and growth of their emission relative intensities. In light of the principle of energy transfer, the varied emitted color of phosphor from blue through white and finally to yellow can be achieved by properly tuning the ratio of normalCe3+∕normalEu2+ .

Reddish-orange-emitting and paramagnetic properties of GdVO4:Sm3+/Eu3+ multifunctional nanomaterials

“…Currently, the most commercially dominated method to obtain WLED 30 products is to mix yellow luminescence from Y3Al5O12: Ce 3+ (YAG: Ce) phosphors with blue luminescence from LED chips 6 , which offers a poor color rendering index (CRI) of 71.6 and a high correlated color temperature (CCT) of 7756 K ascribed to the deficiency of the red light, resulting that the corresponding light generated by this way is relatively cool white light, and this product is not suitable for room lighting [7][8][9] . So it is of great importance to develop a novel kind of reddish-orange-emitting phosphors for UV/n-UV WLEDs.…”

Short belt-like Ca2B2O5·H2O nanostructures: Hydrothermal formation, FT-IR, thermal decomposition, and optical properties

“…Metal borates, such as aluminum borate [12][13][14], magnesium borate [15,16], and barium borate [17][18][19], are remarkable ceramic materials with excellent mechanical properties. Among various metal borates, calcium borates with various chemical compositions have been paid great attention in recent years owing to their great potential applications for glass fibers, antiwear additive, ceramic coatings, porcelain enamel, optics materials, fire retardant, dielectric devices, ultraviolet light sources, light emission diodes, and luminescent phosphors [20][21][22][23][24][25][26][27].…”

Luminescent characteristics and energy transfer of Ca2BO3Cl:Sm3+, Eu3+ red phosphor

“…Recently, chloroborate compounds have been widely utilized as excellent host materials for rare earth ions doped phosphors [21][22][23][24][25]. However, to our knowledge, less report about preparation and investigation of Eu 3+ /Sm 3+ co-doped Ca 2 BO 3 Cl red phosphor can be found.…”