Enhancement of external quantum efficiency and reduction of roll-off in blue phosphorescent organic light emitt diodes using TCTA inter-layer

Kim, Ji Young; Kim, Nam Ho; Kim, Jin Wook; Kang, Jin Sung; Yoon, Ju-An; Yoo, Seung Il; Kim, Woo Young; Cheah, Kok Wai

doi:10.1016/j.optmat.2014.05.010

Cited by 8 publications

(4 citation statements)

References 31 publications

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“…The exciton energy transfer in the warm-state device is shown in F 6. Research shows that the introduction of ILs can effectively solve the problem of energy barriers between different organic functional layers [66]. The performance of WOLEDs based on UEMLs is highly sensitive to the change of exciton RZ [67].…”

Section: Phosphorescent Doping Woleds With Uemlsmentioning

confidence: 99%

“…The exciton RZ and transport property between different EMLs can be reasonably managed using ILs, simplifying the regulation of device performance and improving the efficiency roll-off caused by exciton annihilation at high brightness levels. Research shows that the introduction of ILs can effectively solve the problem of energy barriers between different organic functional layers [66]. The performance of WOLEDs based on UEMLs is highly sensitive to the change of exciton RZ [67].…”

Section: Phosphorescent Doping Woleds With Uemlsmentioning

confidence: 99%

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Progress in Research on White Organic Light-Emitting Diodes Based on Ultrathin Emitting Layers

Zhao,

Hu,

Kong

et al. 2024

Micromachines

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White organic light-emitting diodes (WOLEDs) hold vast prospects in the fields of next-generation displays and solid-state lighting. Ultrathin emitting layers (UEMLs) have become a research hotspot because of their unique advantage. On the basis of simplifying the device structure and preparation process, they can achieve electroluminescent performance comparable to that of doped devices. In this review, we first discuss the working principles and advantages of WOLEDs based on UEML architecture, which can achieve low cost and more flexibility by simplifying the device structure and preparation process. Subsequently, the successful applications of doping and non-doping technologies in fluorescent, phosphorescent, and hybrid WOLEDs combined with UEMLs are discussed, and the operation mechanisms of these WOLEDs are emphasized briefly. We firmly believe that this article will bring new hope for the development of UEML-based WOLEDs in the future.

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Section: Phosphorescent Doping Woleds With Uemlsmentioning

confidence: 99%

Section: Phosphorescent Doping Woleds With Uemlsmentioning

confidence: 99%

Progress in Research on White Organic Light-Emitting Diodes Based on Ultrathin Emitting Layers

Zhao,

Hu,

Kong

et al. 2024

Micromachines

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show abstract

“…In 2014, Kim et al also reported a blue phosphorescent OLED by using mCP and TCTA as nano CML. These CMLs improved the efficiency of the device by increasing exciton in a wider recombination zone, and simultaneously reduced efficiency roll-off [82].…”

Section: Effect Of CML On Luminance and Efficiencymentioning

confidence: 99%

“…It has also been established that the ratio of mixed CML components has also extensively affected the EL characteristics of hybrid white OLEDs [44]. Mixed CML also suppressed phosphorescent quenching by energy transfer to the low-lying non-radiative triplet state of a blue fluorescent dopant in hybrid white OLEDs [82]. Recently, Jou’s group reported a high efficiency and low color temperature OLED by using BSB:Spiro-2CBP blend interlayer as CML, and a highly efficient candle light-style OLED by using a mixed CML of TCTA:TPBi [47,53].…”

Section: Effect Of CML On Luminance and Efficiencymentioning

confidence: 99%

Carrier Modulation Layer-Enhanced Organic Light-Emitting Diodes

et al. 2015

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Organic light-emitting diode (OLED)-based display products have already emerged in the market and their efficiencies and lifetimes are sound at the comparatively low required luminance. To realize OLED for lighting application sooner, higher light quality and better power efficiency at elevated luminance are still demanded. This review reveals the advantages of incorporating a nano-scale carrier modulation layer (CML), also known as a spacer, carrier-regulating layer, or interlayer, among other terms, to tune the chromaticity and color temperature as well as to markedly improve the device efficiency and color rendering index (CRI) for numerous OLED devices. The functions of the CML can be enhanced as multiple layers and blend structures are employed. At proper thickness, the employment of CML enables the device to balance the distribution of carriers in the two emissive zones and achieve high device efficiencies and long operational lifetime while maintaining very high CRI. Moreover, we have also reviewed the effect of using CML on the most significant characteristics of OLEDs, namely: efficiency, luminance, life-time, CRI, SRI, chromaticity, and the color temperature, and see how the thickness tuning and selection of proper CML are crucial to effectively control the OLED device performance.

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Manipulation of Hole and Exciton Distributions in Organic Light-Emitting Diodes with Dual Emission Layers

Song,

Yoo,

Kim

et al. 2023

Electron. Mater. Lett.

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Enhancement of external quantum efficiency and reduction of roll-off in blue phosphorescent organic light emitt diodes using TCTA inter-layer

Cited by 8 publications

References 31 publications

Progress in Research on White Organic Light-Emitting Diodes Based on Ultrathin Emitting Layers

Progress in Research on White Organic Light-Emitting Diodes Based on Ultrathin Emitting Layers

Carrier Modulation Layer-Enhanced Organic Light-Emitting Diodes

Manipulation of Hole and Exciton Distributions in Organic Light-Emitting Diodes with Dual Emission Layers

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