期刊
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS
卷 44, 期 6A, 页码 3659-3662出版社
JAPAN SOC APPLIED PHYSICS
DOI: 10.1143/JJAP.44.3659
关键词
organic light-emitting diode; organic laser diode; high current density; pulse voltage; singlet-singlet exciton annihilation
We succeeded in injecting and transporting a maximum high current density of J = 1163 A/cm(2) in organic light-emitting diodes using short-pulse excitation combined with a highly thermally conductive silicon substrate (thermal conductivity: 148W m(-1) K-1) and a small cathode configuration (cathode radius r = 50 pm). A maximum current density almost 20 times higher than that associated with direct current (DC) operation was observed by driving an OLED with a short pulse voltage. With short-pulse excitation, the decrease in external quantum efficiency. (eta(ext)) obeyed a typical singlet-singlet exciton annihilation model well, indicating that the generation of Joule heat in OLEDs can be suppressed under pulse operation.
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