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Organic electroluminescent (EL) diode with a multilayer structure which consists of alternating layers of organic 8‐hydroxyquinoline aluminum (Alq3) and aromatic diamine has been grown by organic molecular beam deposition. The EL emission from the multilayer structure shows spectral narrowing and the emission energy has been observed to shift to higher energy compared with that in the monolayer structure. Mechanism of spectral narrowing and the emission energy shift in the diode with the multilayer structure have been discussed., This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Yutaka Ohmori, Akihiko Fujii, Masao Uchida, Chikayoshi Morishima, and Katsumi Yoshino, Appl. Phys. Lett. 63, 1871 (1993) and may be found at https://doi.org/10.1063/1.110632.

IS&T/SPIE's Symposium on Electronic Imaging: Science and Technology, 1993, San Jose, CA, United States, Yutaka Ohmori, Masao Uchida, Chikayoshi Morishima, Akihiko Fujii, and Katsumi Yoshino "Novel characteristics of electroluminescent diodes utilizing poly(3-alkylthiophene)s and organic molecules", Proc. SPIE 1910, Electroluminescent Materials, Devices, and Large-Screen Displays, (27 August 1993). DOI: https://doi.org/10.1117/12.151134, Novel characteristics of visible electroluminescent (EL) diodes utilizing poly(3- alkylthiophene)s and organic molecules with superlattice structure have been presented. The diodes with poly(3-alkylthiophene)s emit red-orange light with a broad band emission of 640 nm. The EL diode has unique characteristics in temperature dependence of emission intensity. Superlattice (SL) structure which consists of thin films of organic i-hydroxyquinoline aluminum (Alq3) and aromatic diamine (TPD) has been grown by organic molecular beam deposition. The SL structure was determined by X-ray diffraction, optical absorption and photoluminescence. Photoluminescence peak of Alq3 shifts to higher energy with decreasing layer thickness, suggesting a quantum size effect. The EL diodes with SL structure emit green light at around 520 nm. Quantum size effect in the organic SL structure has been discussed.

Symposium on Integrated Optics, 2001, San Jose, CA, United States, Yutaka Ohmori, Hirotake Kajii, Takahisa Tsukagawa, Katsumi Yoshino, Masanori Ozaki, Akihiko Fujii, Makoto Hikita, Satoru Tomaru, Sabro Imamura, Hisataka Takenaka, Junya Kobayashi, and Fumio Yamamoto "Organic electroluminescent diodes as a light source for polymeric integrated devices", Proc. SPIE 4279, Organic Photonic Materials and Devices III, (15 June 2001). DOI: https://doi.org/10.1117/12.429390, Organic electroluminescent diodes (OLED) were fabricated on a polymeric optical waveguide for use as an optical interconnector in data communication systems. The OLED were fabricated on an ITO sputtered polymer waveguide with a 45 degree mirror by vacuum deposition. The OLEDs, with an emission peak center at 520 nm consist of diamine derivative as a hole transporting layer and tris(8-hydroxyquinoline) aluminum (Alq3) as an emissive layer. We estimated the propagation losses of the waveguide to be 1.35 dB/cm at 520 nm. However, it decreases as increasing the wavelength of the light source and is estimated as 0.37 dB/cm at the wavelength of 614 nm. The optical pulse of more than 5 Mb/s has been obtained from the OLED with Alq3 and diamine derivative. We discuss the properties of the OLED for the light source for polymeric integrated devices.

Organic electroluminescent diodes (OLED) were fabricated on a polymeric optical waveguide for use as an optical interconnector in data communication systems. The OLED were fabricated on an ITO sputtered polymer waveguide with a 45 degree mirror by vacuum deposition. The OLEDs, with an emission peak center at 520 nm consist of diamine derivative as a hole transporting layer and tris(8-hydroxyquinoline) aluminum (Alq3) as an emissive layer. We estimated the propagation losses of the waveguide to be 1.35 dB/cm at 520 nm. However, it decreases as increasing the wavelength of the light source and is estimated as 0.37 dB/cm at the wavelength of 614 nm. The optical pulse of more than 5 Mb/s has been obtained from the OLED with Alq3 and diamine derivative. We discuss the properties of the OLED for the light source for polymeric integrated devices., Symposium on Integrated Optics, 2001, San Jose, CA, United States, Yutaka Ohmori, Hirotake Kajii, Takahisa Tsukagawa, Katsumi Yoshino, Masanori Ozaki, Akihiko Fujii, Makoto Hikita, Satoru Tomaru, Sabro Imamura, Hisataka Takenaka, Junya Kobayashi, and Fumio Yamamoto "Organic electroluminescent diodes as a light source for polymeric integrated devices", Proc. SPIE 4279, Organic Photonic Materials and Devices III, (15 June 2001). DOI: https://doi.org/10.1117/12.429390

Novel characteristics of visible electroluminescent (EL) diodes utilizing poly(3- alkylthiophene)s and organic molecules with superlattice structure have been presented. The diodes with poly(3-alkylthiophene)s emit red-orange light with a broad band emission of 640 nm. The EL diode has unique characteristics in temperature dependence of emission intensity. Superlattice (SL) structure which consists of thin films of organic i-hydroxyquinoline aluminum (Alq3) and aromatic diamine (TPD) has been grown by organic molecular beam deposition. The SL structure was determined by X-ray diffraction, optical absorption and photoluminescence. Photoluminescence peak of Alq3 shifts to higher energy with decreasing layer thickness, suggesting a quantum size effect. The EL diodes with SL structure emit green light at around 520 nm. Quantum size effect in the organic SL structure has been discussed., IS&T/SPIE's Symposium on Electronic Imaging: Science and Technology, 1993, San Jose, CA, United States, Yutaka Ohmori, Masao Uchida, Chikayoshi Morishima, Akihiko Fujii, and Katsumi Yoshino "Novel characteristics of electroluminescent diodes utilizing poly(3-alkylthiophene)s and organic molecules", Proc. SPIE 1910, Electroluminescent Materials, Devices, and Large-Screen Displays, (27 August 1993). DOI: https://doi.org/10.1117/12.151134

This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Masayoshi Yoshida, Akihiko Fujii, Yutaka Ohmori, and Katsumi Yoshino, Appl. Phys. Lett. 69, 734 (1996) and may be found at https://doi.org/10.1063/1.117874., We have realized a three‐layered multicolor organic electroluminescent device utilizing poly (9,9‐dihexylfluorene) and perylene derivatives as emission layers, with diamine derivatives as an electron blocking layer. Emission colors could be selected either blue or red by changing the polarity of the applied voltage. By driving with an ac biased electric field, both emission colors were observed and the intensity ratio of each emission color was modulated by the frequency of the applied ac field.

This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Yutaka Ohmori, Akihiko Fujii, Masao Uchida, Chikayoshi Morishima, and Katsumi Yoshino, Appl. Phys. Lett. 63, 1871 (1993) and may be found at https://doi.org/10.1063/1.110632., Organic electroluminescent (EL) diode with a multilayer structure which consists of alternating layers of organic 8‐hydroxyquinoline aluminum (Alq3) and aromatic diamine has been grown by organic molecular beam deposition. The EL emission from the multilayer structure shows spectral narrowing and the emission energy has been observed to shift to higher energy compared with that in the monolayer structure. Mechanism of spectral narrowing and the emission energy shift in the diode with the multilayer structure have been discussed.

This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Yutaka Ohmori, Akihiko Fujii, Masao Uchida, Chikayoshi Morishima, and Katsumi Yoshino, Appl. Phys. Lett. 62, 3250 (1993) and may be found at https://doi.org/10.1063/1.109089., Multiple quantum well structure consisting of alternating layers of organic 8‐hydroxyquinoline aluminum (Alq3) and aromatic diamine (TPD) has been grown by organic molecular beam deposition. The multiple quantum well structure was determined by x‐ray diffraction, optical absorption, and photoluminescence. Photoluminescence peak of Alq3 shifts to higher energy with decreasing layer thickness, suggesting a quantum size effect. An electroluminescent diode has also been fabricated by using Alq3/TPD multiple quantum well structure.

Multiple quantum well structure consisting of alternating layers of organic 8‐hydroxyquinoline aluminum (Alq3) and aromatic diamine (TPD) has been grown by organic molecular beam deposition. The multiple quantum well structure was determined by x‐ray diffraction, optical absorption, and photoluminescence. Photoluminescence peak of Alq3 shifts to higher energy with decreasing layer thickness, suggesting a quantum size effect. An electroluminescent diode has also been fabricated by using Alq3/TPD multiple quantum well structure., This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Yutaka Ohmori, Akihiko Fujii, Masao Uchida, Chikayoshi Morishima, and Katsumi Yoshino, Appl. Phys. Lett. 62, 3250 (1993) and may be found at https://doi.org/10.1063/1.109089.

We have realized a three‐layered multicolor organic electroluminescent device utilizing poly (9,9‐dihexylfluorene) and perylene derivatives as emission layers, with diamine derivatives as an electron blocking layer. Emission colors could be selected either blue or red by changing the polarity of the applied voltage. By driving with an ac biased electric field, both emission colors were observed and the intensity ratio of each emission color was modulated by the frequency of the applied ac field., This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Masayoshi Yoshida, Akihiko Fujii, Yutaka Ohmori, and Katsumi Yoshino, Appl. Phys. Lett. 69, 734 (1996) and may be found at https://doi.org/10.1063/1.117874.