Metal oxyhalides: an emerging family of nonlinear optical materials

Abstract

Second-order nonlinear optical (NLO) materials have drawn enormous academic and technological attention attributable to their indispensable role in laser frequency conversion and other greatly facilitated applications. The explorations of new...

Li6.58Na7.43Sr4(B9O18)(B12O24)Cl: unprecedented combination of the largest two highly polymerized isolated B–O clusters with novel isolated B9O18 FBB

“…Over the past few decades, borates have become a research hot spot worldwide owing to their extended structural diversity and application potential in the fields of nonlinear optical materials, luminophores, ferroelectric and piezoelectric materials, and semiconductors. [1][2][3][4][5][6][7][8][9][10][11][12][13] There exist three coordination environments of boron, including two, three and four coordinated with oxygen atoms to form linear BO 2 , triangular BO 3 and tetrahedral BO 4 basic units. [14][15][16][17][18][19][20][21] The above basic units can further connect by corner-sharing or/and edgesharing methods, which results in a large number of anionic polymeric borate groups, including isolated clusters, chains, rings, sheets, and framework structures.…”

Band gap modulation and nonlinear optical properties of quaternary tellurates Li2GeTeO6

“…Recently, some oxide crystals have been considered as promising candidates for MIR NLO application. [12][13][14] Different from traditional chalcogenides or pnictides, most of the oxidebased compounds show limited IR transparency (<2 μm) owing to unwanted absorptions. However, some oxide crystals with heavy metal cations possess relatively large IR cutoff edges beyond 6 μm, such as α-AgI 3 O 8 (6.1 μm), 15 Li 2 ZrTeO 6 (7.4 μm), 16 La 3 SnGa 5 O 14 (11.0 μm), 17 Pb 17 O 8 Cl 18 (13.9 μm), 18 Pb 13 O 6 Cl 9 Br 5 (14.0 μm), 19 and Pb 18 O 8 Cl 15 I 5 (16.0 μm).…”

An excellent lead oxyiodide with a strong second-harmonic generation response and a large birefringence induced by the oriented arrangement of highly distorted [PbO4I2] polyhedra

“…Recently [35][36][37][38][39][40][41][42] Inspiringly, large centimeter-sized Pb 13 O 6 Cl 9 Br 5 NLO crystals exhibit a strong SHG response, a broad IR transparency up to 14 μm and a high LDT. Motivated by these ideas, we have successfully developed an effective strategy via cationic substitution to transform SHG-inert Cs 2 I 2 [Pb(OOCCH 2 COO)] (CPMI) into SHG-active K 2 I[PbI(OOCCH 2 COO)] (KPMI) with a polar NCS structure.…”

“…Recently, emerging lead oxyhalide NLO crystals have received growing interest, including Pb 13 O 6 Cl 9 Br 5 , Pb 18 O 8 Cl 15 I 5 , Pb 2 B 5 O 9 I, Pb 2 BO 3 Cl, CsPbCO 3 F, Cs 3 Pb 2 (CH 3 COO) 2 I 5 and Pb 2 GaF 2 (SeO 3 ) 2 Cl. 35–42 Inspiringly, large centimeter-sized Pb 13 O 6 Cl 9 Br 5 NLO crystals exhibit a strong SHG response, a broad IR transparency up to 14 μm and a high LDT. Motivated by these ideas, we have successfully developed an effective strategy via cationic substitution to transform SHG-inert Cs 2 I 2 [Pb(OOCCH 2 COO)] ( CPMI ) into SHG-active K 2 I[PbI(OOCCH 2 COO)] ( KPMI ) with a polar NCS structure.…”