Use of surface plasmon-coupled emission for enhancing light transmission through Top-Emitting Organic Light Emitting Diodes

Wu, Xiushan; Chowdhury, Mustafa H.; Geddes, Chris D.; Aslan, Kadir; Domszy, R. C.; Lakowicz, Joseph R.; Yang, Arthur

doi:10.1016/j.tsf.2007.05.081

Cited by 11 publications

(3 citation statements)

References 35 publications

(104 reference statements)

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“…And the light for SPP1 mode was scattered into the air caused by the rough surface of the TCs. [15] The schematic energy band diagram of transparent PeLED is depicted in Figure 1b. The energy level values of each layer are taken from the literature.…”

Section: Transparent Peledsmentioning

confidence: 99%

High‐Efficiency Top‐Emitting Green Perovskite Light Emitting Diode with Quasi Lambertian Emission

Cai

Zhou

Bai

et al. 2021

Advanced Optical Materials

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applications due to their high color purity, widely tunable bandgap, efficient photoluminescence quantum yields (PLQYs). [1] Various strategies were taken to enhance the external quantum efficiency (EQE) over the past few years, such as optimization of the charge injection layers, passivation of defects, adoption of quasi-2D-based perovskites, and development of submicrometer-perovskite structures. [1b,d,2] Recently, large-area, inkjet-printed, and transparent PeLEDs have also been realized, which laid the foundation for their potential commercial applications. [3] Light-emitting devices with top emission are essential for display application since the bottom side of the device is generally constructed with a thin-film transistor backplane. [4] PeLEDs are suitable for high-resolution flat panel displays such as smartphones and televisions since perovskite emitters exhibit a narrower full width at half maxima (FWHM). [5] Therefore, the top transparent electrode is one of the key factors for efficient, transparent PeLEDs and top-emitting PeLEDs. An inverted transparent PeLED with a high optical transmittance by applying MoO 3 /Al/indium-tin-oxide (ITO)/ Ag/ITO as the top transparent anode yielded an EQE of 5.7%, with an average transmittance of 55%. [3c] Here, the transparent ITO top electrodes were prepared by sputtering deposition method. The plasma generated in the sputtering process would deteriorate the underlying functional layers, which is highly likely to degrade the performance of the device. [6] On the contrary, metal alloy with high transmittance is readily deposited by coevaporation. Thermal evaporation is a mild film deposition method. Metal electrode deposited by thermal evaporation has little detrimental impact on the functional layers, which is more suitable as a transparent electrode for transparent PeLED and top-emitting PeLED. The simplest top-emitting PeLED structure can be built by using a semitransparent top electrode and total-reflective bottom electrode to replace the transparent bottom electrode as in the transparent PeLED. [7] Benefiting from the appropriate optical length of microcavity and enhanced light outcoupling along the optical axis of the cavity, light emission from the top-emitting PeLEDs can be enhanced. [8] Based on this, near-infrared top-emitting PeLED with gold films as reflective and transparent anode achieved a high EQE of 20.2%. [9] However, the undesirable microcavity Metal halide perovskite light-emitting diodes (PeLEDs) are regarded as alternative candidates for next-generation display technologies due to their high efficiency, superior color purity, tunable bandgap. However, the research on transparent and top-emitting PeLED with Lambertian emission profile significantly lags behind due to optical microcavity effect, which has become one of the main obstacles for potential practical display applications. Here, strategies are developed to suppress the microcavity effect by enhancing the transmission of the semitransparent electrode and extending the optical cav...

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Section: Transparent Peledsmentioning

confidence: 99%

High‐Efficiency Top‐Emitting Green Perovskite Light Emitting Diode with Quasi Lambertian Emission

Cai

Zhou

Bai

et al. 2021

Advanced Optical Materials

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“…It was reported that 80% of the emitted light from OLED devices is confined in the substrate [6,7]. Various methods have been proposed to extract the emitted light, such as waveguide modes [8,9], micro lens arras [10] and utilization of surface plasmons [11,12]. The extraction of light from the OLED devices using surface plasmons is made by incorporated in the polymer emitting layer of the gold or silver nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Electroluminescence Enhancement of Polymer Light Emitting Diodes Through Surface Plasmons by Ag Nanoplates

et al. 2016

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This paper reports a study on the surface plasmon effect of Ag nanoplates on electroluminescent property of polymer light emitting diodes. The diode is a single layer light emitting device made of poly [9,9-di-(2-ethylhexyl)-fluorenyl-2,7-diyl] (PEHF). 5 wt.% of Ag nanoplates were incorporated into the PEHF layer. The results showed that the electroluminescence intensity of the diodes is increased by 51.85%, compared with the device without the Ag nanoplates. The enhancement is due to the coupling process between the Ag surface plasmon with the emission light from the PEHF. The occurrence of the coupling process was proved firstly based on the fact that the exciton lifetime of the PEHF:Ag layer is shorter than that without Ag, as measured by time-resolved photoluminescence spectroscopy. Secondly, the PEHF photoluminescence peak at 425 nm is overlaping with the surface plasmon absorption peak of Ag nanoplates.

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“…In view of explosive increase in demands for AMOLED in recent years, future prospects of OLED for general illumination and display technology seem to be very promising, and the fact that it contains no Hg and Pb, and generates no infrared and ultraviolet radiation qualifies it for environmentally and humanly friendly display technology. Whereas huge improvements in the internal quantum efficiency have been achieved by ingenious design of molecular engineering, major contribution to the extension of lifetime comes from encapsulation engineering, and still low light out-coupling efficiency awaits applications of recently discovered surface plasmon coupled emission in conjunction with metallic nanotechnology [1].…”

Section: Introductionmentioning

confidence: 99%

A Study of Photo and Photocatalytic Degradation of Arylamine with Respect to Design of Organic Light-Emitting Diode

Han

2011

MSF

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In our study of organic molecules for OLED, we have paid attention to 4,4'-bis(N-carbazolyl)biphenyl (CBP), an arylamine commonly used as phosphorescent host or hole transport material in OLED, and performed photochemical and photocatalytic experiments. For the photocatalytic experiment, heterogeneous mixture of CBP and TiO2powder (Degussa P25) in tetrahydrofuran solution has been placed under UV radiation. Both photochemical and photocatalytic experiments have resulted in degradation of CBP, however, with widely different rates and degradation products. With ever increasing demand for high performance OLEDs, higher stability and longer lifetime of their organic components are essential. In this respect, current informations are sure to be valuable in the design and operation of OLEDs as well as arylamine-based OLED.

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Use of surface plasmon-coupled emission for enhancing light transmission through Top-Emitting Organic Light Emitting Diodes

Cited by 11 publications

References 35 publications

High‐Efficiency Top‐Emitting Green Perovskite Light Emitting Diode with Quasi Lambertian Emission

High‐Efficiency Top‐Emitting Green Perovskite Light Emitting Diode with Quasi Lambertian Emission

Electroluminescence Enhancement of Polymer Light Emitting Diodes Through Surface Plasmons by Ag Nanoplates

A Study of Photo and Photocatalytic Degradation of Arylamine with Respect to Design of Organic Light-Emitting Diode

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