6′-(DIETHYLAMINO)-1′,2′-BENZOFLUORAN

6′-(Diethylamino)-1′,2′-benzofluoran (CAS: 26628-47-7), also known as Copikem 747, PSD-P, or Yamamoto Red 3, has the following main applications:

1. Color developer for thermal recording materials
   
   
   This compound is used as a color developer or sensitizer in thermal recording materials, widely applied in fax paper, receipt paper, and other thermal printing products.

2. Thermochromic coatings and inks
   
   
   It is used in the preparation of thermochromic coatings and inks, exhibiting color-changing properties with temperature, suitable for temperature indicators, labels, and related products.

3. Security inks and anti-counterfeiting labels
   
   
   Due to its stability and vivid color output, this compound is used in developing security inks and anti-counterfeiting labels, utilizing its reversible color-change property as a measure against forgery.

4. Sensor technology
   
   
   Its chemical versatility makes it of interest in sensor technology, where it can be used to detect acidic vapors or pH changes in industrial or environmental monitoring systems.