Organic Biluminescent Materials for Data Security Applications | Department of Chemistry

Organic Biluminescent Materials for Data Security Applications

Funding Agency: DST-SERB

Principal Investigator: Dr. Debdas Ray

Objectives & Goals

Our group also focuses on donor-acceptor materials that can show afterglow properties after switch-off the irradiation source. These materials have potential applications in security-imaging, data encryption/decryption, anticounterfitting, and sensors.

The modularity and simple synthesis of the multiple-donors(4)-acceptor (D4-A) systems allowed us to develop new data security materials. These systems exhibit biluminescence via fluorescence and persistent-green-RTP at ambient conditions in the amorphous state. We have established that the dimeric excited states can optimize the singlet (S1)-triplet (T1) energy gap, and increase rigidity, which can lead to persistent-green afterglow due to stabilization of the triplet states. We applied them in data security applications revealing a new way of achieving document protection. We intend to take advantage of these materials in bio-imaging applications.

The second family of biluminescent emitters led us to develop Invisible Ink. These light emitters emit white-light via dual fluorescence and white phosphorescence. The focus with this family is to develop new materials for counterfeiting applications.

Key achievements:
a. J. Phys. Chem. Lett. 2018, 9, 3808-3813.

b. J. Phys. Chem. C 2019, 123, 22104−22113

c. ACS Omega 2021, 6, 3858−3865.

d. Mass media article (national and international newspapers)


Associate Professor


Raktim Deka (Ph.D.)