Hybrid Passivated Red Organic LEDs with Prolonged Operation and Storage Lifetime
In addition to mobile and TV displays, there is a trend of organic LEDs being applied in niche markets, such as microdisplays, automobile taillights, and photobiomodulation therapy. These applications mostly do not require to be flexible in form but need to have long operation lifetimes and storage...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-04-01
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| Series: | Molecules |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1420-3049/27/9/2607 |
| _version_ | 1797503837916889088 |
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| author | Dan-Dan Feng Shuang-Qiao Sun Wei He Jun Wang Xiao-Bo Shi Man-Keung Fung |
| author_facet | Dan-Dan Feng Shuang-Qiao Sun Wei He Jun Wang Xiao-Bo Shi Man-Keung Fung |
| author_sort | Dan-Dan Feng |
| collection | DOAJ |
| description | In addition to mobile and TV displays, there is a trend of organic LEDs being applied in niche markets, such as microdisplays, automobile taillights, and photobiomodulation therapy. These applications mostly do not require to be flexible in form but need to have long operation lifetimes and storage lifespans. Using traditional glass encapsulation may not be able to fulfill the rigorous product specification, and a hybrid encapsulation method by combining glass and thin-film encapsulation will be the solution. Conventional thin-film encapsulation technology generally involves organic and inorganic multilayer films that are thick and have considerable stress. As a result, when subjected to extreme heat and stress, the film easily peels off. Herein, the water vapor transmission rate (WVTR) of a 2 µm silicon nitride film prepared at 85 °C is less than 5 × 10<sup>−5</sup> g/m<sup>2</sup>/day and its stress is optimized to be 23 MPa. Red organic LEDs are passivated with the hybrid encapsulation, and the <i>T<sub>95</sub></i> lifetime reaches nearly 10 years if the LED is continuously driven at an initial luminance of 1000 cd/m<sup>2</sup>. In addition, a storage lifespan of over 17 years is achieved. |
| first_indexed | 2024-03-10T03:56:04Z |
| format | Article |
| id | doaj.art-e90b6c29bf6b49f7aefc7ff4be3dde22 |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-10T03:56:04Z |
| publishDate | 2022-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Molecules |
| spelling | doaj.art-e90b6c29bf6b49f7aefc7ff4be3dde222023-11-23T08:46:58ZengMDPI AGMolecules1420-30492022-04-01279260710.3390/molecules27092607Hybrid Passivated Red Organic LEDs with Prolonged Operation and Storage LifetimeDan-Dan Feng0Shuang-Qiao Sun1Wei He2Jun Wang3Xiao-Bo Shi4Man-Keung Fung5Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou 215123, ChinaJiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou 215123, ChinaJiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou 215123, ChinaInstitute of Organic Optoelectronics, Jiangsu Industrial Technology Research Institute (JITRI), Suzhou 215123, ChinaInstitute of Organic Optoelectronics, Jiangsu Industrial Technology Research Institute (JITRI), Suzhou 215123, ChinaJiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou 215123, ChinaIn addition to mobile and TV displays, there is a trend of organic LEDs being applied in niche markets, such as microdisplays, automobile taillights, and photobiomodulation therapy. These applications mostly do not require to be flexible in form but need to have long operation lifetimes and storage lifespans. Using traditional glass encapsulation may not be able to fulfill the rigorous product specification, and a hybrid encapsulation method by combining glass and thin-film encapsulation will be the solution. Conventional thin-film encapsulation technology generally involves organic and inorganic multilayer films that are thick and have considerable stress. As a result, when subjected to extreme heat and stress, the film easily peels off. Herein, the water vapor transmission rate (WVTR) of a 2 µm silicon nitride film prepared at 85 °C is less than 5 × 10<sup>−5</sup> g/m<sup>2</sup>/day and its stress is optimized to be 23 MPa. Red organic LEDs are passivated with the hybrid encapsulation, and the <i>T<sub>95</sub></i> lifetime reaches nearly 10 years if the LED is continuously driven at an initial luminance of 1000 cd/m<sup>2</sup>. In addition, a storage lifespan of over 17 years is achieved.https://www.mdpi.com/1420-3049/27/9/2607red organic LEDshybrid encapsulationSi<sub>x</sub>N<sub>y</sub>operation lifetimestorage lifespan |
| spellingShingle | Dan-Dan Feng Shuang-Qiao Sun Wei He Jun Wang Xiao-Bo Shi Man-Keung Fung Hybrid Passivated Red Organic LEDs with Prolonged Operation and Storage Lifetime Molecules red organic LEDs hybrid encapsulation Si<sub>x</sub>N<sub>y</sub> operation lifetime storage lifespan |
| title | Hybrid Passivated Red Organic LEDs with Prolonged Operation and Storage Lifetime |
| title_full | Hybrid Passivated Red Organic LEDs with Prolonged Operation and Storage Lifetime |
| title_fullStr | Hybrid Passivated Red Organic LEDs with Prolonged Operation and Storage Lifetime |
| title_full_unstemmed | Hybrid Passivated Red Organic LEDs with Prolonged Operation and Storage Lifetime |
| title_short | Hybrid Passivated Red Organic LEDs with Prolonged Operation and Storage Lifetime |
| title_sort | hybrid passivated red organic leds with prolonged operation and storage lifetime |
| topic | red organic LEDs hybrid encapsulation Si<sub>x</sub>N<sub>y</sub> operation lifetime storage lifespan |
| url | https://www.mdpi.com/1420-3049/27/9/2607 |
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