Materials Design of Organic Lasers Aimed at Low Lasing Threshold

Abstract

As the next generation optoelectronic devices, i.e., post─ organic light emitting diodes (OLEDs), organic semiconductor laser diodes (OSLDs) are supposed to be fascinating devices due to their unique properties such as a wide range of emission wavelength tunability, low─ temperature fabrication allowing exible devices, and the compatibility with present OLED technologies. In this report, by focusing on the most promising laser material of 4,4ʼ─ bis[(N ─ carbazole)styryl]biphenyl (BSBCz), the materials design of organic lasing molecules with their photophysical and current injection device properties are summarized. Figure 2. Schematics of various optical resonators including a) Fabry─ Perot, b) 1D and c) 2D DFBs, d) mixed─ order circular DFB, e) vertical─ cavity surface─ emitting laser (VCSEL), f) micro─ ring, and g) micro─ sphere resonators, respectively.

Progress and Perspective toward Continuous‐Wave Organic Solid‐State Lasers

“…[44] However, the modest energy output from shortpulsed organic lasers and their low repetition rates (<kilohertz) limit practical applications. [45][46][47] Long-pulsed (>microsecond) or, possibly, CW lasers with organic gain media have been a long-term challenge. As shown in Figure 2, the long lifetimes (>microsecond) of triplet excitons in organics would lead to severe accumulations during CW photoexcitation.…”