ABSTRACT
Förster Transfer ........................................................ 483 11.6 Novel Fabrication Methods....................................... 487 11.7 Photonic Crystal Lasers with Organic Gain
Media.......................................................................... 489 11.8 Summary.................................................................... 493 Acknowledgment .................................................................. 494 References............................................................................. 494
11.1 INTRODUCTION
Photoexcited solid-state organic lasers have been made with a wide variety gain media including dye-doped polymers,1-4
dye-doped molecular single crystals,5 diluted conjugated polymers,6 neat films of conjugated polymers,7-10 and molecular solids.11-13 These gain media have been included in a fascinating array of resonators to obtain laser action. Molecular solid gain media have included neat films, single crystals as well as doped films deposited from solution11 or sublimation.11-13 Laser work on doped molecular solid films has employed charge-transporting hosts such as 8-hydroxyquiolinato aluminum (Alq) or 2-naphthyl-4,5-bis(4-methoxyphenyl)-1,3-oxazole (NAPOXA). The dopant is usually a laser dye such as DCM or an oligomer such as α-sexithiophene (α-6T) and the concentration of the dopant in the host is of order 1% by weight. If the dopant concentration is too high, the luminescence yield is often lowered due to concentration quenching and aggregate formation.
