Kinetically Protected Carbon-Bridged Oligo(p-phenylenevinylene) Derivatives for Blue Color Amplified Spontaneous Emission

Abstract

in 2016. He concurrently worked as a PRESTO researcher for "New Materials Science and Elemental Strategy" (2011-15), and visiting professor at University of Strasbourg, France (2012-13). His current research interest is synthetic chemistry for creating functional materials that are useful for biological and aqueous environmental conditions.

Blue and Deep‐Blue‐Emitting Organic Lasers with Top‐Layer Distributed Feedback Resonators

“…The synthesis of all the other compounds was done following methods previously reported. [15,19,20] www.advopticalmat.de…”

“…Interestingly, when comparisons are made taking the film absorbance at the excitation density into account, its threshold is similar to that of the COPV2 compounds (see Figure S5, Supporting Information). For the rest of the active compounds used, ASE occurs at longer wavelengths (spectra shown in Figure S6, Supporting Information): the COPV2 family emits between 464 and 475 nm, [15,19] and the terfluorene compounds at around 420 nm, [20] which is located between the emission bands of COPV1 and COPV2 families (see Table 1). The terfluorene compounds are particularly interesting for their low ASE thresholds, although to date, no lasers based on them have been reported.…”

“…This is a consequence of the presence of Tip groups at the COPV2 terminal positions, which provide kinetic protection against molecular photoreaction. [19] Finally, it is useful to compare the performance of the DFB lasers prepared here to state-of-the-art DFB lasers based on solution-processed active films and emitting in the same spectral range. A selection of such lasers, with their corresponding parameters, is listed in Table S3 (Supporting Information).…”

“…Such limitations have been recently overcome through two different synthetic strategies, both aiming to protect the molecular terminal site that is labile to photodegradation: a homopolymer of COPV1, [18] and sterically protected COPVn derivatives with bulky substituents on the terminal sites. [19] The homopolymer, however, emits green because of the extension of conjugation, while the latter compounds show blue emission by taking advantage of their short conjugation lengths with improved photostability.…”

“…Once the feasibility of the resonator preparation process is demonstrated, we proceed to fabricate DFB lasers using as active films PS doped with one of the compounds shown in Figure 1b. These compounds include the recently synthesized COPV1 and COPV2 derivatives with sterically protecting groups on the terminal sites, [19] and two terfluorene compounds, [20] which emit in the spectral band between those of the COPV1 and COPV2 families. These systems show amplified spontaneous emission (ASE) in the range 385-465 nm.…”