Novel spectral band: ultraviolet A mechanoluminescence from Bi³⁺-doped LiYGeO₄

Abstract

Mechanoluminescence (ML) materials, which can emit light under external mechanical stimuli, have aroused wide concern in diverse applications such as stress sensing, anti-counterfeiting and 3D signature. However, MLs located within...

Anionic Regulation toward Bi3+ Selective Occupation for Full-Spectrum White Light Emission

“…The practical feasibility of high-performance NYB 1.5 P 0.5 O:0.005 Bi 3+ phosphors for high-quality illumination in WLED light sources have been tested and realized based on a commercial n-UV LED (365 nm) chip. − The electroluminescence spectrum of a WLED device with a driving current of 100 mA is depicted in Figure (a), which is consistent with the PL spectrum (illustration: CIE coordinates). In particular, the CIE color coordinate of the emission spectrum gradually approaches the white region as the (PO 4 ) 3– unit concentration gradually increases (inset: physical diagram of the luminescence at drive current) (Figure (b)).…”

Cation-defect-induced self-reduction towards efficient mechanoluminescence in Mn2+-activated perovskites

“…The PLE spectra have two peaks monitored at 680 nm, where the strong absorption band (235-350 nm) is derived from the O 2À -Mn 2+ charge transfer band, and the weak absorption peaks within the 370-420 nm range are originated from the transition of the Mn 2+ ion in the 6 A 1g ( 6 S) ground state to the 4 T 1g ( 4 P), 4 T 2g ( 4 D), 4 A 1g / 4 E g ( 4 G), 4 T 2g ( 4 G) and 4 T 1g ( 4 G) excited states, respectively 40,41 (Fig. 2(a)).…”

“…1,2 Since two classic ML materials (ZnS:Mn 2+ and SrAl 2 O 4 :Eu 2+ ) featuring high performances and recoverability were found by Prof. Xu et al in 1998, ML materials have been vigorously developed during the past 30 years. 3–5 Some typical ML materials were found to emit from ultraviolet (UV) to near-infrared (NIR) spectral bands such as LiYGeO 4 :Bi 3+ (UV, 355 nm), 6 SrAl 2 O 4 :Ce 3+ (UV, 375 nm), 7 SrCaSi 2 O 7 :Eu 2+ (blue, 450 nm), 8 MgF 2 :Mn 2+ (orange red, 590 nm), 9 LiNbO 3 :Pr 3+ (red, 619 nm), 10 LiGa 5 O 8 :Cr 3+ (NIR, 716 nm) 11 and Sr 3 Sn 2 O 7 :Nd 3+ (NIR 900 nm). 12 Because the advantages of real-time, recoverability and a linear relationship between ML intensity and applied compression, 13–16 MLs have greater practical application prospects such as in stress sensing, information storage and security, and biomedical stress imaging fields.…”

Luminescence–structure relationships in solids doped with Bi3+

“…Note that several compounds reported in the archival literature do not appear in Table 5 because their crystal structure is either not available ( e.g. Ln 2 SO 6 (Ln = Y, Lu), 17 Sr 3 YAl 2 O 7.5 , 71 BaLa 2 Si 3 O 10 , 72 Sr 2 GdAlO 5 , 27 SrLaBO 4 , 73 LiLuSiO 4 , 74 Sr 3 Lu(BO 3 ) 3 , 75 LiYGeO 4 , 76 Ba 3 Sc 4 O 9 , 77 Ba 2 Ga 2 GeO 7 , 78 Gd 2 MgTiO 6 79 ) or too complex for the calculator that we have designed in this work ( e.g. Sr 2 V 2 O 7 (ICSD-10330), 80 Ba 3 Y 4 O 9 (ICSD-230718), 81 K 2 MgGeO 4 (MP-1212053), 82 Y 4 Al 2 O 9 (ICSD-63650) 83 Ba 2 Y 5 B 5 O 17 (ICSD-8356), 84 Na 3 YSi 3 O 9 (ICSD-20774), 85 Ca 3 Al 4 ZnO 10 (ICSD-120597), 86 CdSiO 3 (ICSD-170703), 87 Sr 3 Sc 4 O 9 , 88 AMB 5 O 10 with M = La, Gd, Y and A = Mg, Zn, and Cd, 89 Li 2 BaP 2 O 7 (ICSD-280927), 90 and MP 3 O 9 with M = Sc, Y, Lu).…”