期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 7, 期 21, 页码 4398-4404出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.6b02224
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资金
- Research Grant Council of Hong Kong S.A.R [CityU 11337616, HKU 711813, C7045-14E]
- CAS-Croucher Funding Scheme for Joint Laboratories [CAS14601]
The beneficial role of the insulating material polyhedral oligomeric silsesquioxane (POSS) as a solution additive or an additional hole-blocking layer to enhance the performance of electroluminescent green light-emitting devices (LEDs) based on CsPbBr3 perovskite nanocrystals is demonstrated. POSS improves the surface coverage and the morphological features of the films deposited either from supernatant or suspension of perovskite nanocrystals. The external quantum efficiency and the luminance efficiency of LEDs with an additional POSS layer reach 0.35% and 1.20 cd/A, respectively, constituting a more than 17-fold enhancement to the reference devices without POSS; the LED peak luminance reaches 2983 cd/m(2), and the device stability is improved. The POSS acts as a hole-blocking layer between the perovskite nanocrystals and TPBi, keeping both electrons and holes located within the active layer for an efficient recombination.
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