Power Efficiency Improvement of White Phosphorescent Organic Light-Emitting Diode with Thin Double-Emitting Layers and Hole-Trapping Mechanism

Juang, Fuh−Shyang; Li, Hong; Wang, Shun-Hsi; Tsai, Yuh‐Shyan; Gao, Minghong; Chi, Yun; Shieh, Han–Ping D.; Hsu, Jen-Sung

doi:10.7567/jjap.50.04dk04

Cited by 9 publications

(4 citation statements)

References 16 publications

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“…While doing this, the thickness of TAPC is reduced to 20 nm to maintain same device thickness as that of device H for better comparison of results. From figure 4(a), the reduction in the current density (J) for device I as compared to device H indicates the decrease in the effective mobility of holes in the HTL of the device by incorporating TCTA as hole buffer layer [58]. This has helped in achieving a better charge balance in the device and a better maximum EQE (4.07%) is obtained.…”

Section: Device Structure Optimizationmentioning

confidence: 98%

Investigation of 4,4′-bis[(N- carbazole) styryl] biphenyl (BSB4) for a pure blue fluorescent OLED with enhanced efficiency nearing the theoretical limit

Barah

Sahoo

Inaganti

et al. 2022

Semicond. Sci. Technol.

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4,4′-bis[(N-carbazole) styryl] biphenyl (BSB4 or BSBCz) is one of the widely studied organic fluorescent materials for blue organic electroluminescent devices in the recent times. In this work, BSB4 is used as a guest material to construct the host-guest matrix for the emissive layer (EML) of a pure blue fluorescent organic light-emitting diode (OLED). A pure blue emission suitable for display application with a Commission Internationale de l’Eclairage (CIE) coordinate of (0.147, 0.070) is achieved by the blue-shift of the emission spectrum of the host-guest matrix from that of the pristine guest (BSB4) molecules. The optimization of OLED structures is carried out by considering (i) charge balance in the emissive layer for high exciton density, and (ii) optical interference of generated light in the organic layers for increased light outcoupling. A thorough comparative study on the use of different combinations of widely used hole and electron transport layers to obtain charge balance in the EML of the OLED, thereby enhancing the external quantum efficiency (EQE) is shown. Optical interference effects in the fabricated OLEDs are analyzed by optical simulation of each device structure by transfer matrix method (TMM). With the optimized device structures, we are able to overcome the 2% EQE limit that has been reported so far for blue fluorescent OLEDs with BSB4 as light emitting material and achieve a maximum EQE of 4.08%, which is near to the theoretical limit of EQE for fluorescent OLEDs.

show abstract

Section: Device Structure Optimizationmentioning

confidence: 98%

Investigation of 4,4′-bis[(N- carbazole) styryl] biphenyl (BSB4) for a pure blue fluorescent OLED with enhanced efficiency nearing the theoretical limit

Barah

Sahoo

Inaganti

et al. 2022

Semicond. Sci. Technol.

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show abstract

“…For example, 59 a sunlight-simulated light source can be used for growing 60 plants indoors. For daily lighting, people can freely choice 61 the most appropriate color temperature while doing var-62 ious activities [5][6][7][8]. The desired chromaticity function 63 was previously achieved by complicated vacuum-deposit-64 ed multilayer stacking.…”

mentioning

confidence: 99%

“…The desired chromaticity function 63 was previously achieved by complicated vacuum-deposit-64 ed multilayer stacking. For instance, owing to the shifting 65 of the recombination zone at various operation voltages, 66 a blue/red/blue [5] or red/blue/red [6] sandwiched struc-67 ture was utilized to achieve chromaticity-stable devices. 68 In chromaticity-tunable devices, deliberate manipulation [9,10].…”

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confidence: 99%

Tunable chromaticity stability in solution-processed organic light emitting devices

Huang

Lin

Fan

et al. 2015

Organic Electronics

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“…Molecular structures of the investigated electron-rich donor materials m-MTDATA, TAPC, NPB, and TCTA, and the bipolar acceptor material 26DCzPPy, as well as their corresponding energy levels from the references[8][9][10][11][12][13].…”

mentioning

confidence: 99%

Efficient exciplex organic light-emitting diodes with a bipolar acceptor

Chen

Wang

et al. 2015

Organic Electronics

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Power Efficiency Improvement of White Phosphorescent Organic Light-Emitting Diode with Thin Double-Emitting Layers and Hole-Trapping Mechanism

Cited by 9 publications

References 16 publications

Investigation of 4,4′-bis[(N- carbazole) styryl] biphenyl (BSB4) for a pure blue fluorescent OLED with enhanced efficiency nearing the theoretical limit

Investigation of 4,4′-bis[(N- carbazole) styryl] biphenyl (BSB4) for a pure blue fluorescent OLED with enhanced efficiency nearing the theoretical limit

Tunable chromaticity stability in solution-processed organic light emitting devices

Efficient exciplex organic light-emitting diodes with a bipolar acceptor

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