Double‐Modification Oriented Design of a Deep‐UV Birefringent Crystal Functionalized by [B₁₂O₁₆F₄(OH)₄] Clusters

Abstract

Polarization modulation of deep-UV light is of significance to current technologies, and to this end, the birefringent crystal has emerged as an invaluable material as it allows for effective light modulation. Herein, a double-modification strategy driven by F and OH anions that makes double effects towards the critical property enhancement of deep-UV birefringent crystals is proposed. This leads to a new hydroxyborate (NH 4 ) 4 -[B 12 O 16 F 4 (OH) 4 ] with giant cluster as a deep-UV birefringent crystal with large birefringence (Δn exp. =

An effective pathway to design and synthesize UV birefringent crystalsviarational assembly of π-conjugated [CO3]2−and [NO3]−triangles

“…Previous studies mainly focused on borate UV birefringent crystals, [9][10][11][12] such as SrAlB 3 O 6 F 2 (0.078 at 1064 nm, 7.65 eV), 13 Li 3 La 2 (BO 3 ) 3 (0.078 at 1064 nm, 5.22 eV), 14 Ca(BO 2 ) 2 (0.247 at 193 nm, 7.34 eV), 15 Ba 2 Zn 2 B 6 O 13 (0.085 at 532 nm, 6.12 eV), 16 and NaMgBe 2 (BO 3 ) 2 F (0.078 at 589 nm, 4.19 eV), 17 which is mainly attributed to the excellent properties of the planar triangle [BO 3 ] 3À group, including the relatively strong anisotropic polarizability and high UV transmittance. [18][19][20][21] It is well known that the [CO 3 ] 2À and [NO 3 ] À groups possess similar pconjugated electronic configurations and planar triangle structures to the [BO 3 ] 3À group. 22,23 In terms of the anisotropic polarizability of anionic groups, the trend of [NO 3 ] À 4 [CO 3 ] 2À 4 [BO 3 ] 3À is generally followed.…”

Analysis of the growth and physicochemical properties of the newly developed stilbazolium derivative 4-N,N-dimethylamino-4-N-methyl stilbazolium 2-formyl benzene sulfonate (DSFS) single crystal: an effective material for nonlinear optical applications

“…From the following equation, it is possible to calculate the disorder in the system as a function of which corresponds to the transition between the localized states and the extended state of the conduction and valence bands, through a parameter known as the Urbach energy (E u ). 41,44 aðhnÞ ¼ a 0 exp hn E u (7) where h, n, a 0 , and E u represent Planck's constant, the incident frequency radiation, a constant and Urbach energy, respectively. The width of the elongated tail of the localized states in the forbidden electronic band gap (Urbach energy or band tail energy) was obtained by plotting a graph between the ln of the absorption coefficient a vs. hn.…”

“…The study of organic NLO crystals is a scholastic area of interest due to their ample applications in different domains, such as signal processing, electro-optic modulators, telecommunication, optical switches, deep UV light, high-density data storage and display technologies. [1][2][3][4][5][6][7][8] The presence of delocalized p-electrons, donor and acceptor moieties, hydrogen bonds and weak Van der Waals forces induce high non-linearity in the organic crystals compared to its counterpart, inorganic materials. 9 Also, tunability of the structure, high laser damage threshold, ultra-fast response and the signicant electro-optic coefficient are the added advantages of the organic materials.…”

Na2BaB12O18F4: A Mixed Alkali/Alkaline-Earth Metal Fluorooxoborate with Two Unprecedented Interpenetrating Three-Dimensional B–O/F Anionic Networks and a Short Ultraviolet Cutoff Edge

“…The aforementioned necessity promoted the emergence of fluorooxoborates as paradigm-shifting UV materials in nonlinear optics. As structural derivatives of borates, the partial substitution of oxygen by fluorine (or O/F substitution) in BO 4 units in borates leads to fluorooxoboron groups, BO x F 4– x ( x = 1, 2, 3). − This seemingly simple fluorination of BO 4 units creates a manifold of positive impacts on the structure and properties of a crystal. From the structural aspect, the number of possible basic units in borates multiplies from BO 2 , BO 3 , and BO 4 to BO 2 , BO 3 , BO 4 , and BO x F 4– x ( x = 1, 2, 3) in fluorooxoborates, and these units can assemble themselves in different combinations with various connection modes (via common corners or edges).…”