Highly Efficient OVPD-Processed Resonant-Cavity OLED Comprising a Semitransparent Ag layer

2012 ◽  
Vol 1402 ◽  
Author(s):  
M. Bösing ◽  
F. Lindla ◽  
M. Brast ◽  
D. Bertram ◽  
D. Keiper ◽  
...  
Keyword(s):  
Resonant Cavity ◽  
Luminous Efficiency ◽  
Organic Light Emitting Diodes ◽  
Organic Layer ◽  
Efficiency Enhancement ◽  
Light Emitting ◽  
Organic Vapor ◽  
Deep Blue ◽  
Organic Vapor Phase Deposition ◽  
Coupling Potential

ABSTRACTThe light out-coupling potential of introducing a semitransparent Ag layer between the anode and the organic layer stack of monochrome bottom-emitting organic light emitting diodes (OLED) is examined. Red and green phosphorescent as well as deep-blue fluorescent resonant-cavity OLED (RC-OLED) comprising a semitransparent Ag layer are processed by means of organic vapor phase deposition (OVPD). An enhancement of the luminous efficiency of up to 81% can be observed.The impressive efficiency enhancement can be explained by a reduced formation of substrate modes in combination with a strong narrowing of the emission spectrum leading to an increased true luminous efficiency.

Hybrid White Organic Light Emitting Diodes (OLED) Processed by Organic Vapor Phase Deposition

2009 ◽  
Vol 1212 ◽  
Author(s):  
Manuel Boesing ◽  
Florian Lindla ◽  
Christoph Zimmermann ◽  
Philipp van Gemmern ◽  
Dietrich Bertram ◽  
...  
Keyword(s):  
Vapor Phase ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Emissive Layer ◽  
Organic Vapor ◽  
Vapor Phase Deposition ◽  
Organic Light ◽  
Organic Vapor Phase Deposition ◽  
Spectrally Resolved ◽  
White Oled

AbstractWhite OLED consisting of a fluorescent blue emissive layer combined with a phosphorescent green and a phosphorescent red emissive layer were processed by means of Organic Vapor Phase Deposition (OVPD). Different concepts to tune the color coordinates of the device are discussed with respect to the luminous efficiency. Furthermore, the influence of device aging on the emitted spectrum is being investigated by means of spectrally resolved lifetime measurements.

Zirconium Tetrakis(8-hydroxyquinolinolate) and Lithium Schiff-Base Cluster Complex for Efficient Charge Injection and Transfer in Green PHOLED processed by OVPD

MRS Advances ◽  
2018 ◽  
Vol 3 (59) ◽  
pp. 3471-3476
Author(s):  
Gintautas Simkus ◽  
Pascal Pfeiffer ◽  
Simon Sanders ◽  
Dominik Stümmler ◽  
Peter K. Baumann ◽  
...  
Keyword(s):  
Organic Light Emitting Diodes ◽  
Cluster Complex ◽  
Carrier Injection ◽  
Light Emitting ◽  
Organic Vapor ◽  
Efficient Charge ◽  
Base Cluster ◽  
Organic Vapor Phase Deposition ◽  
Unipolar Devices ◽  
Improve Device

ABSTRACTTypical electron transport (2,2′,2″-(1,3,5-benzinetriyl)-tris(1-phenyl-1-H-benzimidazole) (TPBi)) and injection (Cs2CO3) materials are successfully replaced by zirconium tetrakis(8-hydroxyquinolinolate) (Zrq4) and lithium 2-((o-tolylimino)methyl)-phenolate (EI-111) in simplified OLED (organic light-emitting diodes) processed by organic vapor phase deposition (OVPD). The performance of combining Zrq4 and EI-111 is analyzed in unipolar devices and compared to devices with configurations of Zrq4/Cs2CO3, TPBi/EI-111 and TPBi/Cs2CO3. Current density-voltage (J-V) measurements are performed and correlated to different carrier injection and transport properties. The investigated material combinations are implemented in the simplified OLED structures and compared to each other. To account for the high HOMO level of Zrq4, 5 nm of TPBi are added to confine holes and excitons in the emissive layer (EML) and to improve device performance. After tailoring the organic stack for OLED with Zrq4, a remarkable boost in device efficiency is observed. The luminous efficacy increased from 3.0 to 21.9 lm/W and the EQE from 2.1 to 11.0 % for a device with Zrq4/EI-111. Furthermore, OLED having Zrq4/Cs2CO3 show an even greater enhancement to 26.3 lm/W and 11.7 %.

scholarly journals Color-Tunable Organic Light Emitting Diodes for Deep Blue Emission by Regulating the Optical Micro-Cavity

Molecules ◽  
2020 ◽  
Vol 25 (12) ◽  
pp. 2867
Author(s):  
Jixin Jiang ◽  
Weiye Zheng ◽  
Junfei Chen ◽  
Zheng Xu ◽  
Dandan Song ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Resonant Cavity ◽  
Blue Emission ◽  
Optical Path ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Deep Blue ◽  
Organic Light ◽  
Blue Emitters ◽  
Micro Cavity

Nowadays, most blue organic light emitting diodes (OLEDs) are fabricated by using sky-blue emitters which are more easily synthesized when compared with other deep blue emitters. Herein, we put forward a new idea of using an optical micro-cavity based on metal electrodes to regulate electroluminance (EL) spectra of sky-blue organic light emitting diodes to obtain a saturated deep blue emission with a narrowed full-width at half-maximum (FWHM). First, we simulate micro-cavity OLEDs and find that the transmission of the anode plays an important role in the forward emission. Meanwhile, the optical path of micro-cavity OLEDs as well as the phase shifting from electrodes influence the EL spectra and induce the extra intensity enhancement. The results show that when the resonant cavity optical path is regulated by changing the thickness of emitting layer (EML) from 25 nm to 75 nm in the micro-cavity, the EL peak of blue OLEDs has a redshift from 479 nm to 493 nm with FWHM shifting from 69.8 nm to 83.2 nm, when compared to the device without the micro-cavity, whose approximate EL peak and FWHM are 487 nm and 87 nm, respectively. However, the efficiency of electroluminescence decreases in micro-cavity OLEDs. We speculate that this is on account of the ohmic contact between ITO and Ag, the surface plasma effect and the rough morphology induced by Ag electrodes.

Simplified efficient phosphorescent organic light-emitting diodes by organic vapor phase deposition

2017 ◽  
Vol 111 (24) ◽  
pp. 243301 ◽  
Author(s):  
P. Pfeiffer ◽  
C. Beckmann ◽  
D. Stümmler ◽  
S. Sanders ◽  
G. Simkus ◽  
...  
Keyword(s):  
Vapor Phase ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Vapor ◽  
Vapor Phase Deposition ◽  
Organic Light ◽  
Organic Vapor Phase Deposition

Deep Blue Organic Light-Emitting Diodes Based on [7,7-Dimethyl-9-(10-phenylanthracen-9-yl)-7H-Indeno[1,2-f] Isoquinoline] Derivatives

2020 ◽  
Vol 20 (11) ◽  
pp. 6648-6652
Author(s):  
Jinho Park ◽  
Beomsu Jang ◽  
Yu Ji Moon ◽  
Hakjun Lee ◽  
Young Kwan Kim ◽  
...  
Keyword(s):  
Indium Tin Oxide ◽  
Power Efficiency ◽  
Light Emitting Diodes ◽  
Blue Emission ◽  
Luminous Efficiency ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Deep Blue ◽  
Organic Light ◽  
Isoquinoline Derivatives

In this study, we synthesized and characterized two novel deep blue emitting materials based on indenoquinoline-substituted phenylanthracene derivatives. Multilayer organic light-emitting diodes were fabricated with the following sequence: indium-tin-oxide (ITO)/4,4′,4″-tris[2-naphthyl(phenyl)amino (2-TNATA)/4,4′-bis(N-N-naphthyl)-N-phenylamino) biphenyl (NPB)/Blue emitting material (1 or 2)/Bathophenanthroline (Bphen)/lithium quinolate (Liq)/Al. A device B using ‘7,7-dimethyl-9-(10-phenylanthracen-9-yl)-7H-indeno[1,2-f] isoquinoline (2)’ as an emitter showed the efficient emission with the luminous efficiency, power efficiency, and external quantum efficiency of 2.30 cd/A, 1.02 lm/W, 2.94% at 20 mA/cm2, respectively. This device exhibited deep-blue emission with the Commission Internationale De LÉnclairage (CIE) coordinates of (0.16, 0.08) and λmax = 436 nm at 8.0 V.

High-efficiency, long-lifetime deep-blue organic light-emitting diodes

2021 ◽  
Vol 15 (3) ◽  
pp. 208-215 ◽  
Author(s):  
Soon Ok Jeon ◽  
Kyung Hyung Lee ◽  
Jong Soo Kim ◽  
Soo-Ghang Ihn ◽  
Yeon Sook Chung ◽  
...  
Keyword(s):  
High Efficiency ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Deep Blue ◽  
Organic Light ◽  
Long Lifetime

Novel Carbazole-based Multifunctional Materials with Hybridized Local and Charge-Transfer Excited State Acting as Deep Blue Emitters and Phosphorescent Hosts for Highly Efficient Organic Light-Emitting Diodes

2021 ◽  
Author(s):  
Haitao Zhou ◽  
Mengna Yin ◽  
Zhenhong Zhao ◽  
Yanqin Miao ◽  
Xin Jin ◽  
...  
Keyword(s):  
Excited State ◽  
Charge Transfer ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Multifunctional Materials ◽  
Light Emitting ◽  
Highly Efficient ◽  
Deep Blue ◽  
Organic Light ◽  
Blue Emitters

In this work, two carbazole- and benzo[d]oxazole-based novel multifunctional materials with hybridized local and charge-transfer (HLCT) characteristic, namely OCI and OCT, which could act as deep-blue fluorophors and phosphorescent hosts,...

Sign in / Sign up

Export Citation Format

Share Document