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Abstract

Comparing with traditional single organic light-emitting device (OLED), the luminance efficiency and lifetime of tandem OLED are significantly improved. Therefore, it is of crucial importance to in depth study the influence of microcavity effect on the performance of top emitting tandem OLED. In this paper, taking the blue organic light emitting device for example, the change rule of optical and electrical properties of top-emitting tandem blue-light device are studied by combining optical simulation with practical experiments. The specific experiment is as follows. The top emitting tandem blue organic light devices are fabricated, in which the two light-emitting layers are located at the first anti node and second anti node, the second anti node and third anti node, and the third anti node and fourth anti node in the optical structure of the device respectively. It is found that the performance of the device is better when the two emitting layers of the top-emitting tandem blue light device are located at the second anti node and third anti node in the optical structure of the device respectively. That is to say, when the current density of the device is 15 mA/cm ², the current efficiency of the device reaches 10.68 cd/A, color coordinate (CIE x, y) of the device is (0.14, 0.05), and the time of the brightness decreases from 100% to 95% in 1091.55 hours, which is likely to be due to the fact that when the cavity length of the device is long, it can not only improve the recombination rate of hole and electron in the first light-emitting unit, weaken the surface plasmon polarition effect, reduce the influence of the fluctuation of the film thickness on the cavity length of the device, but also play a role of wrapping partials to a certain extent, improve the efficiency and prolong the device lifetime. The research results provide an important theoretical and data basis for designing the top-emitting tandem blue light device with high efficiency and long lifetime. In the future, we will continue to systematically and detailedly study the top emitting tandem organic light-emitting devices, which will provide strong support for preparing the laminated devices with high efficiency long-lifetime, and lower cost.

Keywords:

optical design/
tandem nlue organic light emitting devices/
current efficiency/
lifetime

Authors and contacts

Corresponding author:Yuan Guang-Cai,yuanguangcai@boe.com.cn

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References

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DownLoad: Full-Size Img PowerPoint

波长/nm	折射率
波长/nm	HAT-CN	NPB	TCTA	ADN	DAS-ph	TPBi	Liq
465	2.02	2.05	1.96	2.09	1.96	1.70	1.85
545	1.92	1.94	1.88	1.89	1.88	1.66	1.79
620	1.88	1.89	1.85	1.83	1.85	1.64	1.76

DownLoad: CSV

Device@15 mA/cm²	V/V	L/cd·m^–2	CE/cd·A^–1	PE/lm·W^–1	EQE/%	CIEx	CIEy
5 nm	6.76	1548	10.32	4.78	5.25	0.1372	0.0516
25 nm	7.11	1425	9.51	4.26	4.88	0.3463	0.4545
45 nm	7.42	1380	9.22	3.90	4.69	0.3425	0.6028
65 nm	8.30	615	4.13	1.61	2.20	0.3621	0.6218
85 nm	8.86	825	5.53	1.96	2.82	0.1375	0.0405
105 nm	9.51	1470	9.82	3.14	4.55	0.1318	0.4528
125 nm	10.21	1603	10.68	3.28	5.25	0.1369	0.0512
145 nm	10.80	1530	10.20	2.96	5.02	0.3326	0.4168
165 nm	11.11	1021	6.80	1.92	4.91	0.3463	0.4545
185 nm	11.32	634	4.23	1.16	2.32	0.3425	0.6028
205 nm	11.66	799	5.32	1.43	2.51	0.1375	0.0405
225 nm	11.98	1534	10.22	2.69	5.12	0.1310	0.4512
245 nm	12.34	1580	10.53	2.66	5.36	0.1369	0.0502
265 nm	12.62	1504	10.03	2.49	5.08	0.3512	0.4555

DownLoad: CSV

Device@15 mA/cm²	V/V	L/cd·m^–2	CE/cd·A^–1	PE/lm·W^–1	EQE/%	CIEx	CIEy	LT95(h) @50 mA/cm²
B	3.71	978	6.52	5.51	4.08	0.1376	0.0514	58.26
C	6.87	1548	10.32	4.71	6.62	0.1372	0.0516	93.88
D	7.33	1603	10.68	4.58	6.86	0.1369	0.0512	140.65
E	8.12	1579	10.53	4.06	6.77	0.1369	0.0508	79.88

DownLoad: CSV

Device@15 mA/cm²	V/V	L/cd·m^–2	CE/cd·A^–1	PE/lm·W^–1	EQE/%	CIEx	CIEy	LT95(h) @50 mA/cm²
F	3.90	880	5.87	4.72	3.05	0.1385	0.0504	46.12
H	7.21	1238	8.26	3.59	4.29	0.1383	0.0508	80.88
I	7.72	1683	11.22	4.57	5.86	0.1379	0.0511	93.21
J	8.31	1547	10.32	3.91	5.35	0.1378	0.0515	72.36

DownLoad: CSV

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Vol. 69, Issue 9 - 2020-05-05

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