TY - JOUR

T1 - Novel compounds in the MMeR(BO3)2 borate family (M = alkali metal, Me = alkaline earth metal, R = rare-earth element)

T2 - Syntheses, crystal structures and luminescent properties

AU - Uralbekov, B.

AU - Shevchenko, V.

AU - Kuznetsov, A.

AU - Kokh, A.

AU - Kononova, N.

AU - Bolatov, A.

AU - Kokh, K.

PY - 2019/12/1

Y1 - 2019/12/1

N2 - This review focuses on the recently discovered new compounds in the MMeR(BO3)2 borate family (where M = alkali metal, Me = alkaline earth metal, and R = rare-earth element), describing their crystal structures and luminescent properties. The basic building block for this structure is the two-layer {R[A(BO3)2]2} package (where A is an alkali metal and/or alkali earth metal). The features of the A-cation distribution in the structure determine the unit-cell lattice parameters and symmetry of the compounds. Some borates have not been synthesized because the structure is no longer maintained for relatively large R cation sizes (La, Ce for KBaY(BO3)2 borate family). Many new rare-earth doped borates with down-conversion luminescent properties have been discovered and various colour-tunable phosphor materials were developed by changing the doping concentration and by controlling the fraction of the rare earth ions. A review of the literature clearly shows that the mechanism of the energy transfer between the active ions in the co-doped borates is preferably via electric multipolar interaction, while the exchange interaction is negligible. Emission intensity of Tb3+, Eu3+, and Mn2+-doped MMeR(BO3)2 borates can be effectively sensitized by Ce3+ co-doping, making these borate materials promising colour-tunable light emitting phosphor materials for pc-wLED application.

AB - This review focuses on the recently discovered new compounds in the MMeR(BO3)2 borate family (where M = alkali metal, Me = alkaline earth metal, and R = rare-earth element), describing their crystal structures and luminescent properties. The basic building block for this structure is the two-layer {R[A(BO3)2]2} package (where A is an alkali metal and/or alkali earth metal). The features of the A-cation distribution in the structure determine the unit-cell lattice parameters and symmetry of the compounds. Some borates have not been synthesized because the structure is no longer maintained for relatively large R cation sizes (La, Ce for KBaY(BO3)2 borate family). Many new rare-earth doped borates with down-conversion luminescent properties have been discovered and various colour-tunable phosphor materials were developed by changing the doping concentration and by controlling the fraction of the rare earth ions. A review of the literature clearly shows that the mechanism of the energy transfer between the active ions in the co-doped borates is preferably via electric multipolar interaction, while the exchange interaction is negligible. Emission intensity of Tb3+, Eu3+, and Mn2+-doped MMeR(BO3)2 borates can be effectively sensitized by Ce3+ co-doping, making these borate materials promising colour-tunable light emitting phosphor materials for pc-wLED application.

KW - Crystal structure

KW - Down-conversion

KW - KBaR(BO)

KW - KSrR(BO)

KW - Luminescent properties

KW - NaBaR(BO)

KW - Phosphors

KW - KBaR(BO3)(2)

KW - CE3+

KW - EU3+

KW - YB

KW - IONS

KW - KSrR(BO3)(2)

KW - PHOTOLUMINESCENCE PROPERTIES

KW - PHOSPHOR

KW - ND

KW - GROWTH

KW - NaBaR(BO3)(2)

KW - ENERGY-TRANSFER

KW - ULTRAVIOLET

UR - http://www.scopus.com/inward/record.url?scp=85072208939&partnerID=8YFLogxK

U2 - 10.1016/j.jlumin.2019.116712

DO - 10.1016/j.jlumin.2019.116712

M3 - Article

AN - SCOPUS:85072208939

VL - 216

JO - Journal of Luminescence

JF - Journal of Luminescence

SN - 0022-2313

M1 - 116712

ER -