Efficiency enhancement of fluorescent blue organic light-emitting diodes using doped hole transport and emissive layers

Nam Ho Kim; You-Hyun Kim; Ju-An Yoon; Seung Il Yoo; Kok Wai Cheah; Furong Zhu; Woo Young Kim

doi:10.3788/COL201614.043001

Chinese Optics Letters, Volume. 14, Issue 4, 043001(2016)

Efficiency enhancement of fluorescent blue organic light-emitting diodes using doped hole transport and emissive layers

Nam Ho Kim¹, You-Hyun Kim¹, Ju-An Yoon¹, Seung Il Yoo¹, Kok Wai Cheah³, Furong Zhu³, and Woo Young Kim^1,2、*

¹Department of Green Energy & Semiconductor Engineering, Hoseo University, 513-3, 2nd Engineering Building, 20, Hoeo-ro beon-gil, baebang-eup, Asan-si, Chungcheongnam-do 31499, South Korea

²Department of Engineering Physics, McMaster University, 1280 Main St W, Hamilton L8S 4L8, Canada

³Department of Physics, Hong Kong Baptist University, Hong Kong, Kowloon Tong, Waterloo Road 224, China

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Figures & Tables(7)

Fig. 1. Energy band diagrams of the blue OLED devices A, B, C, and D.

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Fig. 2. (A) Normalized and (B) original absorption spectrum of BCzVBi with PL spectra of NPB and Bphen.

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Fig. 3. Plots of (A) current density versus voltage and (B) luminous efficiency versus current density of BOLED devices.

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Fig. 4. EL spectra of blue OLED devices at 6 V.

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Fig. 5. (A) Transit time by the photocurrent of BCzVBi at 35 V, and (B) the field dependent mobility of BCzVBi.

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Table 1. Layer Structure of Blue OLED Devices (Thickness Unit=Å)

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Table 1. Layer Structure of Blue OLED Devices (Thickness Unit=Å)

Device		HTL	EML	ETL		EIL	metal
A	NPB (700)		ADN:BCzVBi-7% (300)		Bphen (300)	Liq (20)	Al (1200)
B	NPB (600)	NPB:BCzVBi-7% (100)	ADN:BCzVBi-7% (300)		Bphen (300)	Liq (20)	Al (1200)
C	NPB (700)		ADN:BCzVBi-7% (300)	Bphen:BCzVBi-7% (100)	Bphen (200)	Liq (20)	Al (1200)
D	NPB (600)	NPB:BCzVBi-7% (100)	ADN:BCzVBi-7% (300)	Bphen:BCzVBi-7% (100)	Bphen (200)	Liq (20)	Al (1200)

Table 2. Calculated Field-Dependent Electron Mobility of BCzVBi
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Table 2. Calculated Field-Dependent Electron Mobility of BCzVBi
Voltage (V) Time (μs) Mobility ( ${cm}^{2} / Vs$ )
25 31.40 $6.24 \times 10^{- 6}$
30 20.40 $8.00 \times 10^{- 6}$
35 13.70 $1.02 \times 10^{- 5}$
40 9.79 $1.25 \times 10^{- 5}$
45 8.02 $1.36 \times 10^{- 5}$
50 5.63 $1.74 \times 10^{- 5}$
Hole Mobility of BCzVBi [11] $1.0 \times 10^{- 3}$

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Nam Ho Kim, You-Hyun Kim, Ju-An Yoon, Seung Il Yoo, Kok Wai Cheah, Furong Zhu, Woo Young Kim, "Efficiency enhancement of fluorescent blue organic light-emitting diodes using doped hole transport and emissive layers," Chin. Opt. Lett. 14, 043001 (2016)

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