Effect of molecular weight on the efficiency of poly(N-vinylcarbazole)-based polymer light-emitting diodes
Polymer light-emitting diodes based on poly(N-vinylcarbazole) (PVK) with molecular weights M{sub W} of 1.1 x 10{sup 6} and {approx}7.5 x 10{sup 4} are compared. For devices without an electron transport layer (ETL), the high M{sub W} PVK yields higher external quantum efficiency (0.67% vs 0.18%), but for devices with an ETL, the low M{sub W} PVK yields higher efficiency (1.13% vs 0.83%). This intriguing difference is believed to result from higher energetic disorder in the high M{sub W} polymer and different recombination zone-quenching metal electrode distances, in agreement with Konezny et al. [Appl. Phys. Lett. 97, 143305 (2010)].
- Research Organization:
- Ames Lab., Ames, IA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC02-07CH11358
- OSTI ID:
- 1033596
- Report Number(s):
- IS-J 7647; APPLAB; TRN: US1200585
- Journal Information:
- Applied Physics Letters, Vol. 99, Issue 20; ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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