Pure exciplex-based white organic light-emitting diodes with imitation daylight emissions

Luo, Dian; Hsieh, Chung-Tsung; Wang, Yen‐Po; Chuang, Thomas C.; Chang, Hsiu-Ju; Chang, Chih-Hao

doi:10.1039/c8ra04986f

Cited by 13 publications

(14 citation statements)

References 43 publications

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“…Thus, the hole can be directly injected into the EML from the HTL. 42 In contrast, devices A2d and B2d used TCTA as the donor in the EML, generating a barrier between the HTL and EML. In addition to the carrier injection issue, the respective hole mobility of TCTA and TAPC is estimated to be about 3 × 10 −4 cm 2 V −1 s −1 and 1 × 10 −2 cm 2 V −1 s −1 .…”

Section: Resultsmentioning

confidence: 99%

Harnessing bipolar acceptors for highly efficient exciplex-forming systems

et al. 2022

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Section: Resultsmentioning

confidence: 99%

Harnessing bipolar acceptors for highly efficient exciplex-forming systems

et al. 2022

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“…The TCTA:CN-T2T exciplex emission peak was recorded at 539 nm, which red-shifts to the longer wavelengths compared to the fluorescence of TCTA and CN-T2T. In addition, the close fluorescence and phosphorescence of the TCTA:CN-T2T indicates the Δ E ST is extremely small, favoring the RISC from triplet to singlet via environmental heat [ 18 ]. Figure 2 b shows the transient PL decay of the TCTA:CN-T2T sample.…”

Section: Resultsmentioning

confidence: 99%

A Method to Realize Efficient Deep-Red Phosphorescent OLEDs with a Broad Spectral Profile and Low Operating Voltages

Chen

Huang

et al. 2021

Materials

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Organic light-emitting diodes (OLEDs) used as phototherapy light sources require sufficient spectral distribution in the effective wavelength ranges and low operating voltages. Herein, a double emitting layer structure consisting of a red-emitting Ir(piq)2acac and a deep-red Ir(fliq)2acac was designed to generate a broad electroluminescence spectrum. An efficient TCTA:CN-T2T exciplex system was used as the host of the emitting layer, facilitating effective energy transfer from the exciplex host to the red and deep-red phosphors. The materials used in the exciplex host were also used as the carrier transport layers to eliminate the energy barriers and thus increase the current density. The hole injection layer structures were varied to examine the hole injection capabilities and the carrier balance. The resulting optimized phosphorescent OLEDs with a broad spectral profile exhibit a 90% coverage ratio in the target ranges from 630 to 690 nm, together with a high peak efficiency of 19.1% (10.2 cd/A and 13.8 lm/W). The proposed device only needs 5.2 V to achieve a power density of 5 mW/cm2, implying that the device could be driven via two series-connected button cell batteries. These results illustrate the feasibility of our design concepts and demonstrate the realization of a portable and lightweight OLED phototherapy light source.

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“…The multiple exciplex-forming blended layers were employed for WOLEDs [81,[91][92][93][94]. The WOLED with four different exciplex emission bands was demonstrated employing two differentdonor-acceptor blends [91].…”

Section: Emitting Structure Of Multiple Donor-acceptor Blendsmentioning

confidence: 99%

Recent progress on exciplex-emitting OLEDs

Kim

2019

Journal of Information Display

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The thermally-activated-delayed-fluorescence (TADF) characteristics makes exciplexes being the hot subject in the organic light-emitting diode (OLED) research field. The theoretical limit for the efficiency of the conventional fluorescent OLEDs have been leaped by exploiting the triplet harvesting ability of exciplexes. Exciplexes are easily formed by blending electron donor molecules and electron acceptor molecules, which are generally hole transporting materials and electron transporting materials, respectively, resulting in easy access for employing exciplexes to OLEDs. We introduce the photo-physical characteristics of exciplexes derived from the charge-transfer characteristics and their application to OLEDs as emitters. Single exciplex-emitting OLEDs as well as exciplex emission-based white OLEDs are covered in this review.

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Pure exciplex-based white organic light-emitting diodes with imitation daylight emissions

Abstract: Three hole-transporting material (HTM)/electron-transporting material (ETM) combinations are chosen to generate blue, green and red exciplexes, allowing us to design precise device architectures for the fabrication of exciplex-based white OLEDs with daylight-like emissions.

Cited by 13 publications

References 43 publications

Harnessing bipolar acceptors for highly efficient exciplex-forming systems

Harnessing bipolar acceptors for highly efficient exciplex-forming systems

A Method to Realize Efficient Deep-Red Phosphorescent OLEDs with a Broad Spectral Profile and Low Operating Voltages

Recent progress on exciplex-emitting OLEDs

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