SHOWA DENKO K.K. provides dyes that can absorb lights the wavelengths of which are in the region of near infrared rays (NIRs). The dyes can be used as an NIR-absorbing material. Moreover, they can cause polymerization and decoloration when used in combination with specific organic borates and a long-wave light.
SHOWA DENKO 's typical NIR-photosensitive dye and its derivatives have structures as shown below. There are some variations of modified counter-anion portions. These dyes can absorb lights whose wavelengths are up to 817-820 nm. Their molar absorption coefficients are larger than 105. IRB and IRT have their second absorption band at around 640 nm.
Structure
Grade
IR-T
IR-13F
X
N(C2H5)2
N(C2H5)2
Y
N(C2H5)2
OCH3
Z-
λ1st(nm)*1
(ε×10-5)
817
1.33
819
1.55
λ2nd(nm)*1
640
--
*1) Acetonitrile
Absorption spectrum
When used in combination with specific organic borates, our NIR-photosensitive dyes can cause polymerization and decoloration, as follows:
(1)Polymerization
R・
+
M(Monomer)
→
RM・
RM
+
M
→
RMn・
(2)Decoloration
R・
+
Dye・
→
Dye-R
Colorless
P3B (An organic borate)
● The dyes can also be used for applications other than the above. ●
The information contained herein is based upon data considered true and accurate. However, SHOWA DENKO K.K. accepts
no responsibility for any liability or risk which may result from the handling and use of products.
