Ce(IO₃)₂F₂⋅H₂O: The First Rare‐Earth‐Metal Iodate Fluoride with Large Second Harmonic Generation Response

Abstract

What is the most significant result of this study?In recent years, extensive research and continuous development have been presented on second-order nonlinear optical (NLO) crystal materials due to their potential applications in telecommunications, optical information processing, and optical data storage. In this study,t he first rare-earth iodate fluoride, Ce(IO 3 ) 2 F 2 ·H 2 O, has been synthesized, The results show that Ce(IO 3 ) 2 F 2 ·H 2 Oi sa ni odate fluoride with an ew structure and has potential applications in the field of nonlinear optics. What was the inspiration for this cover design?For us, the first encounter with geometry is on the blackboard at school. From that time on, we have been fascinated by the beauty of symmetry.C oincidentally,g eometric structures also inspire many chemists and play af undamental role in determining new ideas. Thus, this cover combines the elements of laser frequency doubling using an NLO crystal, the structure of Ce(IO 3 ) 2 F 2 ·H 2 Oa nd geometry to create a"surrealistic world".What other topics are you working on at the moment?We are currently focusing on the investigation of new photoelectric functional crystals, such as NLO and birefringent crystals. Especially,w et ry to design new compounds with excellent optical properties by the introduction of fluorine into, for example, iodates, borates, and phosphates. Extensive experiments prove that this is an effective design strategy to synthesize new materials.Invited for the cover of thisi ssuei sS hilie Pan and co-workers at Xinjiang Technical Institute of Physics and Chemistry,C hinese Academy of Sciences. The first rare-earth iodate fluoride, Ce(IO 3 ) 2 F 2 ·H 2 O, has beens ynthesized, which produces al arge second harmonic generation response. Read the full text of the article at

(NH4)Bi2(IO3)2F5: An Unusual Ammonium‐Containing Metal Iodate Fluoride Showing Strong Second Harmonic Generation Response and Thermochromic Behavior

“…Dipole moment calculations were performed to estimate the SHG contribution of SHG‐active units. The local dipole moment of an [IO 3 ] − group was calculated to be 13.09–15.06 D, which was in good agreement with those of reported iodates . The x and z components of the total polarizations from all four [IO 3 ] − groups within one unit cell counteracted each other completely, while the components added up to a net dipole moment of 32.55 D. It has been reported that the SHG contribution of [IO 3 ] − in Bi(IO 3 )F 2 (11.5 KDP) was 77.1 %, corresponding to 8.86 KDP.…”

“…As a result, a series of excellent iodate SHG crystals have been reported, including AMoO 3 (IO 3 ) (A=Rb, Cs), BaNbO(IO 3 ) 5 , NaI 3 O 8 , A 2 Ti(IO 3 ) 6 (A=Li, Na), (NH 4 )[MoO 3 (IO 3 )], ReI 5 O 14 (Re=Y and Gd), BiO(IO 3 ), and Bi 2 (IO 4 )(IO 3 ) 3 . Recently, fluorine‐containing iodates, such as Bi(IO 3 )F 2 , Bi 3 OF 3 (IO 3 ) 4 , ABi 2 (IO 3 ) 2 F 5 (A=K, Rb, Cs), α‐ and β‐Ba[VFO 2 (IO 3 ) 2 ], α‐ and β‐Ba 2 [VO 2 F 2 (IO 3 ) 2 ]IO 3 , α‐ and β‐Ba 2 [GaF 4 (IO 3 ) 2 ](IO 3 ), RbIO 2 F 2 , CsIO 2 F 2 , and Ce(IO 3 ) 2 F 2 ⋅H 2 O, have been demonstrated to be new types of promising NLO iodate crystals. The introduction of fluoride into iodates can not only enrich the crystal structure but can also broaden the band gap and enlarge the laser damage threshold (LDT) .…”

LiGaF2(IO3)2: A mixed-metal gallium iodate-fluoride with large birefringence and wide band gap

“…-based iodatefluorides, such as 3.97 eV for Bi(IO 3 )F 2 [47], 2.39 eV for CsVO 2 F(IO 3 ) [6] and 2.6 eV for Ce(IO 3 ) 2 F 2 •H 2 O [48]. Hence, it is believed that both fluoride anions and blueshift cations such as Ga 3+ cation can widen the band gaps of metal iodates.…”

REI5O14 (RE=Y and Gd): Promising SHG Materials Featuring the Semicircle‐Shaped I5O143− Polyiodate Anion

“…To the best of our knowledge, the study of metal polyiodates only involves the alkali metal or Ag + and Ba 2+ iodate systems. Many rare‐earth iodates also possess excellent SHG properties, for example, La(IO 3 ) 3 has a large SHG signal of roughly 400× SiO 2 . Accordingly, the combination of a trivalent metal cation such as RE 3+ and a polyiodate anion is expected to afford new SHG materials.…”