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https //iaeme com/Home/journal/IJIERD 16 editor@iaeme com International Journal of Industrial Engineering Research and Development (IJIERD) Volume 13, Issue 1, January December 2022, pp 16 19 Article[.]
International Journal of Industrial Engineering Research and Development (IJIERD) Volume 13, Issue 1, January-December 2022, pp 16-19 Article ID: IJIERD_13_01_003 Available online at https://iaeme.com/Home/issue/IJIERD?Volume=13&Issue=1 ISSN Print: 0976–6979 and ISSN Online: 0976–6987 DOI: https://doi.org/10.34218/IJIERD.13.1.2022.003 © IAEME Publication THE STUDY OF ORGANIC LIGHT EMITTING DIODE FOR VEHICLE WITH GLASS FRIT WITH HERMETIC SEAL Minh-Tran Anh1 Dong Nai Technology University, Dong Nai, Vietnam ABSTRACT The study of organic light emitting diode for vehicle with glass frit with hermetic seal with 931 days of lifetime OLED encapsulation The experimental result shown that as the TPBi thickness is 20 nm, the OLED module is obtained a maximum luminance of 21100 cd/m2, EQE of 6.8%, CE of 20.1 cd/A and PE of 15.1 lm/W, respectively The shear strain and leakage testing is 12.995kg and 4.2×10-8 atm*cc/s Key words: organic light-emitting device (OLED), laser encapsulation, glass frit Cite this Article: Minh-Tran Anh, The Study of Organic Light Emitting Diode for Vehicle with Glass Frit with Hermetic Seal, International Journal of Industrial Engineering Research and Development, 13(1), 2022, pp 16-19 https://iaeme.com/Home/issue/IJIERD?Volume=13&Issue=1 INTRODUCTION Organic Light-Emitting Diodes (OLEDs) have attracted much attention to their potential value about a lot of lighting and display in the future.[1] In the last years, the improvement of the encapsulation technique, electrode materials and substrate processing will overcome the issue of OLED degradation.[2] However, the organic materials are usually very susceptible to vapor, moisture and oxygen So the hermetic encapsulation is a necessary to important solution [3] A low diffusion vapor moisture and low absorption moisture properties of the made module is an ideal choice to avoid the damage to the OLED chip [4] The laser processing technology in encapsulation is used to its coherence, non-contact process and complex shapes process [5] It is not only available of the OLED chip for temperature-sensitive materials, but also resist to the vapor, moisture and oxygen The usage of glass frit is advantage of a lower joint temperature, low strain and higher surface smooth [6] EXPERIMENTAL AND DEVICES The device is a 0.09 cm2 active area based on un-doped OLED with a three-layer structure The cathode pad is deposited by lithium fluoride (LiF) 1nm /aluminum (Al) 150 nm Electron Transport Layer, ETL is deposited by 2,2',2"-(1,3,5-Benzinetriyl)-tris(1-phenyl-1-Hbenzimidazole) (TPBi) Alq3 acted as emission layer, EML Hole Transport Layer, HTL is https://iaeme.com/Home/journal/IJIERD 16 editor@iaeme.com The Study of Organic Light Emitting Diode for Vehicle with Glass Frit with Hermetic Seal deposited by N,N'-di[(1-naphthyl)-N,N'-diphenyl]-(1,1'-biphenyl)-4,4'-diamine (NPB) The device’s cross section is shown in Fig All organic layers are deposited under high vacuum of 1.2 ×10-6Torr and then the device is directly to an automated laser processing system for encapsulation Figure The green OLED device is in (a) Cross section (b) Schematic diagram Glass frit of the encapsulated OLED sample is achieved under the laser power of 2.595W and the scanning speed of 0.1 mm/s with a localized heating way To spray 10 l/min of nitrogen to prevent water vapor and oxygen into the glass cap while the package process is making RESULTS AND DISCUSSIONS 3.1 The Measurement of OLED Fig 4(a)(b)(c) is shown by (a) the current density-voltage and luminance-voltage (J-V & L-V) characteristics, (b) external quantum efficiency (EQE) and power efficiencies (PE) including electroluminescence (EL) spectra of the device, (c) the test of shear strength with UV glue and glass frit When the thickness of TPBi layer is changed to 10 nm /20 nm /30 nm /40 nm, a maximum luminance after package process is obtained 13710cd/m2 at 8V (1111 mA/cm2), 21100cd/m2 at 10V (2160 mA/cm2), 19204cd/m2 at 12V (1060 mA/cm2), 20813cd/m2 at 14V (1094 mA/cm2), respectively The luminance loss with to without package only has 0.9 %/ 0.1 %/ 0.5 %/ 0.6 % The maximum EQE is 5.7 % /6.8 % /7.7 % /8.0 % The maximum current efficiency is 19.2 cd/A /20.1 cd/A /19.3 cd/A /23.8 cd/A The maximum power efficiency is 12.3 lm/W /14.6 lm/W /15.9 lm/W /15.5 lm/W When the luminance is set at 1000 cd/m 2, the operating voltage is 3.7 V /3.8 V /5V /6V The test of the shear strength is 2.338kgf with UV glue and 12.995kgf with glass frit as shown in Fig 2(c) The shear strength of glass frit with encapsulation is the best choice https://iaeme.com/Home/journal/IJIERD 17 editor@iaeme.com Minh-Tran Anh Figure The OLED is measured (a) Current density–voltage and luminance–voltage (J– V & L-V) characteristics, (b) external quantum efficiency (EQE) and power efficiencies (PE) as a function of brightness The inset shows electroluminescence (EL) spectrum of device, (c) the test of shear strength with UV glue and glass frit 3.2 Stretched Exponential decay (SED) model for an OLED Lifetime Stretched exponential decay (SED) of an OLED is expressed as equation (1) Where L, L0, t, τ, and β are the OLED luminance, initial OLED luminance, current time, decay the time period, and a stretched exponent, respectively.[7,8] Finally, the lifetime of the OLED is arrived to 931 days as is shown in Fig Figure The test of an OLED is burned in https://iaeme.com/Home/journal/IJIERD 18 editor@iaeme.com The Study of Organic Light Emitting Diode for Vehicle with Glass Frit with Hermetic Seal CONCLUSIONS This experiment utilizes the favorable laser characteristics and reduces the effect of temperature influence the organic materials at the encapsulation In the encapsulation process, we use the minimum laser power of 2.595W and scan speed of 0.1 mm/s to cure the glass frit achieve the OLED encapsulation 931 days of luminous highly lifetime OLED encapsulation incorporating a NPB/ TPBi and Alq3 as hole / electron and light emitting layers The OLED device is change the electron transport layer (TPBi) thickness to 10/20/30/40 nm As the TPBi thickness is 20 nm at the electron transport layer, the OLED device is obtained a maximum luminance of 21100 cd/m2, external quantum (EQE) of 6.8%, current efficiencies (CE) of 20.1 cd/A, and power efficiencies (PE) of 15.1 lm/W, respectively The OLED device achieves a low driving voltage of 4V at 1000 cd/m2 The shear strength and leakage testing is 12.995kg and 4.2×10-8 atm*cc/s REFERENCES [1] Moon, Yu Kyung, Ho Jin Jang, Sanju Hwang, Seongsoo Kang, Sinheui Kim, Juwon Oh, Sangheon Lee, Dongho Kim, Jun Yeob Lee, and Youngmin You "Modeling Electron‐Transfer Degradation of Organic Light‐Emitting Devices." Advanced Materials 33, no 12 (2021): 2003832 [2] Tang, Man-Chung, Mei-Yee Chan, and Vivian Wing-Wah Yam "Molecular Design of Luminescent Gold (III) Emitters as Thermally Evaporable and Solution-Processable Organic Light-Emitting Device (OLED) Materials: Focus Review." Chemical Reviews 121, no 13 (2021): 7249-7279 [3] Zang, Chunxiu, Shihao Liu, Mengxin Xu, Ruifang Wang, Chen Cao, Zelin Zhu, Jiaming Zhang et al "Top-emitting thermally activated delayed fluorescence organic light-emitting devices with weak light-matter coupling." Light: Science & Applications 10, no (2021): 1-10 [4] Cao, Linyu, Kody Klimes, Yunlong Ji, Tyler Fleetham, and Jian Li "Efficient and stable organic light-emitting devices employing phosphorescent molecular aggregates." Nature Photonics 15, no (2021): 230-237 [5] Wen, Xue-Mei, Yan-Gang Bi, Fang-Shun Yi, Xu-Lin Zhang, Yue-Feng Liu, Wen-Quan Wang, Jing Feng, and Hong-Bo Sun "Tunable surface plasmon-polariton resonance in organic lightemitting devices based on corrugated alloy electrodes." Opto-Electronic Advances 4, no (2021): 200024-1 [6] Jing, Yan-Yun, Xiao-Dong Tao, Ming-Xue Yang, Xu-Lin Chen, and Can-Zhong Lu "Triptycene-imbedded thermally activated delayed fluorescence emitters with excellent film morphologies for applications in efficient nondoped and doped organic light-emitting devices." Chemical Engineering Journal 413 (2021): 127418 [7] Van der Meeren, Louis, Joost Verduijn, Jie Li, Ellen Verwee, Dmitri V Krysko, Bogdan V Parakhonskiy, and Andre G Skirtach "Encapsulation of cells in gold nanoparticle functionalized hybrid Layer-by-Layer (LbL) hybrid shells–Remote effect of laser light." Applied Surface Science Advances (2021): 100111 [8] Shih, Hsing-Kun, Yung-Peng Chang, Chun-Nien Liu, Kenneth Li, and Wood-Hi Cheng "Laserexcited single crystal phosphor in white LED for wide field of view and high enhanced central brightness for vehicle headlights." AIP Advances 12, no (2022): 015018 [9] Asari, Tomotaka, Mamoru Miyachi, Yutaro Oda, Takaaki Koyama, Hiroaki Kurosu, Makoto Sakurai, Masanao Tani, Yoshiaki Yasuda, and Hiroshi Toshiyoshi "Adaptive driving beam system with MEMS optical scanner for reconfigurable vehicle headlight." Journal of Optical Microsystems 1, no (2021): 014501 https://iaeme.com/Home/journal/IJIERD 19 editor@iaeme.com .. .The Study of Organic Light Emitting Diode for Vehicle with Glass Frit with Hermetic Seal deposited by N,N''-di[ (1- naphthyl)-N,N''-diphenyl]- (1, 1''-biphenyl)-4,4''-diamine (NPB) The device’s... is obtained 13 710 cd/m2 at 8V (11 11 mA/cm2), 211 00cd/m2 at 10 V ( 216 0 mA/cm2), 19 204cd/m2 at 12 V (10 60 mA/cm2), 20 813 cd/m2 at 14 V (10 94 mA/cm2), respectively The luminance loss with to without package... Light Emitting Diode for Vehicle with Glass Frit with Hermetic Seal CONCLUSIONS This experiment utilizes the favorable laser characteristics and reduces the effect of temperature influence the organic