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23 Apr 2012

Volume 100, Issue 17, Articles (17xxxx)

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Appl. Phys. Lett. 100, 171903 (2012); http://dx.doi.org/10.1063/1.4704193 (3 pages)

Y. Peng and K. Kempa
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A nanoimprinted, optically tuneable organic laser

Bodo H. Wallikewitz, Gueorgui O. Nikiforov, Henning Sirringhaus, and Richard H. Friend

Appl. Phys. Lett. 100, 173301 (2012); http://dx.doi.org/10.1063/1.4705303 (3 pages) | Cited 2 times

Online Publication Date: 24 April 2012

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We present a means to optically tune the emission of an organic laser reversibly over a range of 14 nm. This is enabled by incorporating a photochromic spiropyran (10,30-dihydro-10,30,30-trimethyl-6-nitrospiro[2H-1-benzopyran-2,20-(2H)-indole]) into the gain medium formed by the laser dye Rhodamine 700 in poly(methyl methacrylate). This is structured by nanoimprinting to form a distributed feedback resonator. Exposure of the device to ultraviolet and visible light leads to a reversible refractive index change of the photochromic additive and the gain medium, which enables the continuous shift of the laser wavelength. This is possible without compromising the optical gain properties of the device.
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42.55.Mv Dye lasers
42.60.Fc Modulation, tuning, and mode locking
42.79.-e Optical elements, devices, and systems
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The investigation of the diffusion length of cathode materials in organic light emitting devices through impedance characteristics

I-Wen Wu, Chia-Lin Chuang, Po-Sheng Wang, Wei-Hsuan Tseng, and Chih-I Wu

Appl. Phys. Lett. 100, 173302 (2012); http://dx.doi.org/10.1063/1.3700805 (4 pages) | Cited 2 times

Online Publication Date: 25 April 2012

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A non-destructive method to measure the diffusion length of the cathode materials into the organic layers in organic light emitting diodes (OLEDs) is demonstrated. The measurement is based on a correlation between the transition voltage in the impedance-voltage (Z-V) characteristics, the density of the accumulation charges, and the thickness of the electron transport layers (ETLs). The transition voltages in Z-V characteristics deviate from the theoretical values owing to the decrease of the effective ETL thickness caused by the diffusion of the cathode materials, which can be used to measure the diffusion length of metal ions into organic layers in OLEDs.
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85.60.Jb Light-emitting devices
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