Improving the color-rendering index of a tandem warm white organic light-emitting device by employing a simple fabrication process

Ye Yu; Chen Cao; Zhijun Wu; Qihui Wu; Wenyan Lin; Xuekang Peng; Yu Jin; Xining Zhang; Huishan Yang; Qingxiao Tong

doi:10.1364/OL.44.000931

Optics Letters
Vol. 44,
Issue 4,
pp. 931-934
(2019)
•https://doi.org/10.1364/OL.44.000931

Improving the color-rendering index of a tandem warm white organic light-emitting device by employing a simple fabrication process

Ye Yu, Chen Cao, Zhijun Wu, Qihui Wu, Wenyan Lin, Xuekang Peng, Yu Jin, Xining Zhang, Huishan Yang, and Qingxiao Tong

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Ye Yu, Chen Cao, Zhijun Wu, Qihui Wu, Wenyan Lin, Xuekang Peng, Yu Jin, Xining Zhang, Huishan Yang, and Qingxiao Tong, "Improving the color-rendering index of a tandem warm white organic light-emitting device by employing a simple fabrication process," Opt. Lett. 44, 931-934 (2019)

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Abstract

We realized an efficient spectra-stable tandem white organic light-emitting device (WOLED) with pleasurable warm white emission and an extremely high color-rendering index (CRI) simultaneously by connecting a fluorescent blue unit and a phosphorescent dual-color unit via an easy-fabrication charge generation unit (CGU). Over a wide range of driving current density, the tandem warm white OLED exhibited general CRI ( $R_{a}$ ) value exceeding 85 and special CRI ( $R_{9}$ ) value close to 57. In addition, Duvs are within the tolerance for CRI measurements, ensuring validity and logicality of the calculated results concerning $R_{a}$ and $R_{9}$ . The obtained tandem OLED showed the maximum efficiencies of 38 cd/A and 22.9 lm/W, and still maintained high efficiencies of 35.5 cd/A and 17.2 lm/W at the luminance of $1000 cd / m^{2}$ . Moreover, we studied the origins of both extreme color stability in dual-color OLED and extremely efficient electron injection within the CGU. To the best of our knowledge, this is the first report regarding quantitative values of both $R_{9}$ and the Duv for a high-Ra tandem WOLED.

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Device	$B_{1}$	$B_{2}$	$B_{3}$	$B_{4}$
J ( $mA / {cm}^{2}$ )	(V, CE) (V, cd/A)	(V, CE) (V, cd/A)	(V, CE) (V, cd/A)	(V, CE) (V, cd/A)
10	(3.9, 29.2)	(3.9, 33.1)	(4.0, 22.4)	(39, 11.3)
20	(4.3, 24.4)	(4.2, 27.2)	(4.4, 17.9)	(4.3, 9.5)
30	(4.6, 21.2)	(4.5, 23.3)	(4.7, 15.0)	(4.5, 8.5)
40	(4.8, 18.8)	(4.7, 20.4)	(4.9, 13.2)	(4.8, 7.8)
50	(5.0, 16.9)	(4.9, 18.0)	(5.0, 11.8)	(4.9, 7.2)
60	(5.1, 15.3)	(5.1, 16.1)	(5.2, 10.7)	(5.1, 6.7)
Device	$B_{1}$	$B_{2}$	$B_{3}$	$B_{4}$
$(x, y)_{20}$	(0.284, 0.629)	(0.285, 0.629)	(0.285, 0.629)	(0 285, 0.629)

Device	CE (cd/A)		PE (Im/W)
Device	Max	$η_{1000}$	Max	$η_{1000}$
$C_{1}$	32.0	30.3	37.8	26.2
$C_{2}$	26.1	25.6	24.1	21.7
$C_{3}$	25.3	23.7	31.4	19.7
$C_{4}$	23.7	21.9	29.8	17.9

J ( $mA / {cm}^{2}$ )	$R_{10}$	$R_{11}$	$R_{12}$	$R_{13}$	$R_{14}$	$R_{15}$
2	76.6	80.2	75.0	92.1	90.5	90.9
10	73.4	78.4	70.6	90.5	89.7	91.9
14	72.5	78.4	69.3	90.3	89.4	91.9
34	69.9	77.9	63.9	89.7	88.3	92.1

Device	$B_{1}$	$B_{2}$	$B_{3}$	$B_{4}$
J ( $mA / {cm}^{2}$ )	(V, CE) (V, cd/A)	(V, CE) (V, cd/A)	(V, CE) (V, cd/A)	(V, CE) (V, cd/A)
10	(3.9, 29.2)	(3.9, 33.1)	(4.0, 22.4)	(39, 11.3)
20	(4.3, 24.4)	(4.2, 27.2)	(4.4, 17.9)	(4.3, 9.5)
30	(4.6, 21.2)	(4.5, 23.3)	(4.7, 15.0)	(4.5, 8.5)
40	(4.8, 18.8)	(4.7, 20.4)	(4.9, 13.2)	(4.8, 7.8)
50	(5.0, 16.9)	(4.9, 18.0)	(5.0, 11.8)	(4.9, 7.2)
60	(5.1, 15.3)	(5.1, 16.1)	(5.2, 10.7)	(5.1, 6.7)
Device	$B_{1}$	$B_{2}$	$B_{3}$	$B_{4}$
$(x, y)_{20}$	(0.284, 0.629)	(0.285, 0.629)	(0.285, 0.629)	(0 285, 0.629)

Device	CE (cd/A)		PE (Im/W)
Device	Max	$η_{1000}$	Max	$η_{1000}$
$C_{1}$	32.0	30.3	37.8	26.2
$C_{2}$	26.1	25.6	24.1	21.7
$C_{3}$	25.3	23.7	31.4	19.7
$C_{4}$	23.7	21.9	29.8	17.9

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Optics Letters