MUMBAI, India, July 11 -- Intellectual Property India has published a patent application (202421033847 A) filed by Indian Institute Of Technology, Indore, Madhya Pradesh, on April 29, 2024, for 'system and method to customize acceptor/donor type counter ions for selective enhancement of electrochromic device.'

Inventor(s) include Rajneesh Misra; Pinjari Dilip Ananda; Dr. Rajesh Kumar; and Love Bansal.

The application for the patent was published on July 11, under issue no. 28/2025.

According to the abstract released by the Intellectual Property India: "System and method to customize acceptor/donor type counter ions for selective enhancement of electrochromic device Symmetrical and unsymmetrical tetracyanobuta-1,3-diene (TCBD) and dicyanoquinodimethane (DCNQ) bridged triphenylamine derivatives TPA 1-3 are designed and synthesized by the [2 + 2] cycloaddition-retroelectrocyclization reaction. The photophysical, electrochemical, and computational analyses reveal strong charge-transfer (CT) in these derivatives, which could be modulated by altering the number of TCBD and DCNQ acceptors. The incorporation of TCBD and DCNQ in the ethyne-bridged triphenylamine dimer resulted in a redshift of the absorption from the UV region to the visible and near infrared region respectively with lowering of the HOMO-LUMO gap, which is also supported by the DFT studies. The thermogravimetric analysis (TGA) shows that ethyne bridged triphenylamine dimer shows higher thermal stability compared to TCBD and DCNQ-substituted triphenylamines TPA 1-3. The doping of TPA 1-3 in a P3HT//EV-based electrochromic device increases the overall performance of the device when doped suitably. TPA 1 device shows the enhancement in color contrast, TPA 2 shows a faster-switching speed and excellent stability, and TPA 3 shows the increase in coloration efficiency when doped in EV to make the solid-state electrochromic device. Thus, depending upon the requirements, the suitable TPA 1-3 material can be doped to make real-life electrochromic devices."

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