Frank J. Onorato

Naphthalocyanine chromophores for WORM-type optical data storage media

Hoechst Celaneses proprietary naphthalocyanine record-ing layer materials exhibit excellent performance for a write-once read many (WORM) optical data storage media. This pit-forming medium shows a CNR greater than 50 dB and a bit error rate less than 1 x 10 for data recorded at either 780 or 830 nm. The stability under accelerated aging conditions is superior to that for coririercial media.

Accelerated Aging Studies for Organic Optical Data Storage Media

The excellent stability of Hoechst Celanese WORM media was demonstrated in accelerated aging studies. CNR data was measured as a function of exposure time for disks exposed to 65°/80% RH, 80°/80% RH, and 90°/80% RH. Disks were also exposed to a high intensity xenon lamp to compare the relative stability to visible and ultraviolet radiation. The stability of the polycarbonate substrate and the recording layer were investigated.