Effect of various red phosphorescent dopants in single emissive white phosphorescent organic light-emitting devices

Jong Hyun Lim; Jin Wook Kim; Geum Jae Yoon; Ayse Turak; Woo Young Kim

doi:10.3788/COL201715.051602

Journals >Chinese Optics Letters >Volume 15 >Issue 5 >Page 051602 > Article

Chinese Optics Letters
Vol. 15, Issue 5, 051602 (2017)

Effect of various red phosphorescent dopants in single emissive white phosphorescent organic light-emitting devices

Jong Hyun Lim^1、2, Jin Wook Kim^3、*, Geum Jae Yoon¹, Ayse Turak⁴, and Woo Young Kim^1、4、**

Author Affiliations

¹Department of Green Energy & Semiconductor Engineering, Hoseo University, Asan 31499, Korea

²R&D Center, A-PRO Co. Ltd., Gunpo 15830, Korea

³Department of Electrical and Electronic Engineering, The University of Hong Kong, Hong Kong 070, China

⁴Department of Engineering Physcis, McMaster University, Hamilton, Ontario L8S 4L7, Canada

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DOI: 10.3788/COL201715.051602 Cite this Article Set citation alerts

Jong Hyun Lim, Jin Wook Kim, Geum Jae Yoon, Ayse Turak, Woo Young Kim. Effect of various red phosphorescent dopants in single emissive white phosphorescent organic light-emitting devices[J]. Chinese Optics Letters, 2017, 15(5): 051602 Copy Citation Text

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Fig. 1. Schematic structure of white PHOLEDs and configuration molecules of organic materials in EML.

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(a–c) Predicted white OLED devices A, B, and C spectra (black line) combining the PL of the RGB of each dopant and the comparison based upon the CMF formula of X, Y, and Z.

Fig. 2. (a–c) Predicted white OLED devices A, B, and C spectra (black line) combining the PL of the RGB of each dopant and the comparison based upon the CMF formula of X, Y, and Z.

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Fig. 3. (a–c) Luminous efficiencies – luminance characteristics of white PHOLEDs with different red phosphorescent dopants and (d) a comparison between optimized white PHOLEDs with 0.6%, 0.4%, and 0.8% dopant concentration, respectively.

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Fig. 4. CIEXY coordinates of white PHOLEDs with different red phosphorescent dopants, (a) Ir(piq)3 A1–A4, (b) Ir(pq)2(acac) B1–B4, (c) Ir(btp)2(acac) C1–C4 (the direction of the arrow is related to 5, 7.5, and 10 V, respectively), and (d) the EL spectrum of optimized devices A3, B2, and C4.

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Fig. 5. PL spectrum of mCP, FIrpic, and Ir(ppy)3, and the EL spectrum of mCP as host materials and the absorption spectrum of (a) Ir(piq)3, (b) Ir(pq)2(acac), and (c) Ir(btp)2(acac).

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Fig. 6. J-V characteristics of white PHOLEDs with different red phosphorescent dopants: (a) Ir(piq)3 A1–A4, (b) Ir(pq)2(acac) B1–B4, (c) Ir(btp)2(acac) C1–C4, and (d) optimized devices A3, B2, and C4.

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Devices	EML configuration of Devices A1–A4, B1–B4, and C1–C4 of White PHOLEDs
White PHOLED A1–A4	$mCP : FIrpic - 8.0 % : Ir {(ppy)}_{3} - 0.5 % : Ir {(piq)}_{3} - x %$
White PHOLED B1–B4	$mCP : FIrpic - 8.0 % : Ir {(ppy)}_{3} - 0.5 % : Ir (pq)_{2} (acac) - x %$
White PHOLED C1–C4	$mCP : FIrpic - 8.0 % : Ir {(ppy)}_{3} - 0.5 % : Ir {(btp)}_{2} (acac) - x %$

Table 1. Schematic of the Different Red Phosphorescent Dopant Materials and Concentration Used in White PHOLEDs

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White PHOLEDs	Driving Voltage	Maximum Luminous Efficiency	CRI	$Δ$ ${CIE}_{XY}$ from 5 V to 10 V	${CIE}_{XY}$ at 10.0 V
$Ir {(piq)}_{3}$ , A3	4.5 V	11.0 cd/A	61.8	(−0.072, −0.006)	(0.340, 0.375)
$Ir {(pq)}_{2} (acac)$ , B2	4.5 V	17.2 cd/A	72.9	(−0.060, −0.017)	(0.367, 0.402)
$Ir {(btp)}_{2} (acac)$ , C4	5.0 V	10.3 cd/A	50.0	(−0.060, −0.025)	(0.232, 0.388)