Temperature activated mirror-less laser action from a hole-transport conjugated-polymer

摘要

A plethora of experimental reports and evidences from recent times have collectively taken efforts in developing a novel mirror-less laser. Breakthrough in Conjugated polymer lasers unravel numerous attractive research direction over the last decade. The present study experimentally demonstrated a temperature-activated/controlled amplified spontaneous emission (ASE) in a hole-transport conjugated polymer (HTCP) Poly[N,N'-bis(4-butyl-phenyl)-N,N'-bis(phenyl)-benzidinel [poly-TDP (4B)]. The poly-TDP (4B) dissolved in toluene under wide range concentration. The solution of different concentration was pumped with an Nd:YAG (355 nm) laser. For temperature lower than 37 degrees C, the poly-TDP (4B) did not produce ASE, but for the 40 degrees C, the ASE is observed. Furthermore, the output energy of the ASE is dependent on the temperature of the solution. The ASE output energy attains maximum at a temperature of 78 degrees C, and then the output falls drastically. The time-resolved spectroscopy studies showed the temperature responsiveness of the HTCP poly-TDP (4B) in the sub-nanosecond time domain. The temperature-dependent laser action is due to reversible dimerization property of the poly-TDP (4B), and it is rare.