Tsis ntev los no, pab pawg tshawb fawb ntawm xibfwb Liangsheng Liao los ntawm Soochow University thiab lawv cov neeg koom tes tau luam tawm ib daim ntawv hu ua "Efficient Near-Infrared Electroluminescence from Lanthanide-Doped Perovskite Quantum Cutters" on Angew. Chem. Int. Ed.
Daim ntawv qhia pom qhov ua tau zoo nyob ze-infrared LED nrog lub ncov EQE ntawm 7.7 feem pua ntawm lub nruab nrab wavelength ntawm 990 nm, sawv cev rau qhov ua tau zoo tshaj plaws perovskite-based LEDs nrog emission wavelengths tshaj 850 nm.
Taw qhia
Perovskite nanocrystals (PeNCs) nthuav tawm qhov loj- thiab muaj pes tsawg leeg-tunable luminescence nrog kev ua haujlwm siab thiab siab xim purity hauv pom lub teeb. Txawm li cas los xij, kom tau txais txiaj ntsig zoo electroluminescence (EL) hauv cheeb tsam ze-infrared (NIR) yog qhov nyuaj, txwv nws cov peev xwm siv tau.
Ntawm no, peb ua kom pom qhov ua tau zoo nyob ze-infrared lub teeb-emitting diode (LED) uas txuas EL wavelength mus rau 1000 nm los ntawm doping ytterbium ions rau hauv PeNC matrix (Yb3 ntxiv: PeNCs), uas yog ncaj qha rhiab heev los ntawm PeNC matrix. Yb3 ntxiv ion kom ua tiav. Cov txheej txheem quantum tailoring ua tau zoo ua rau Yb3 ntxiv rau: PeNCs kom ua tiav photoluminescence quantum yields (PLQYs) siab li 126 feem pua.
Siv halide composition engineering thiab deg passivation cov tswv yim los txhim kho PLQY thiab them nqi thauj khoom sib npaug, peb ua kom pom qhov ua tau zoo nyob ze-infrared LED nrog lub ncov EQE ntawm 7.7 feem pua ntawm nruab nrab wavelength ntawm 990 nm, sawv cev rau qhov ua tau zoo tshaj plaws rau emission wavelengths tshaj 850 nm. . Perovskite-based LEDs.
Lub ntsiab lus tshiab: Hauv txoj kev tshawb no, peb doped ytterbium ions rau hauv perovskite nanocrystals kom ntev lub electroluminescence wavelength mus rau 1000 nm. Lub synergistic nyhuv ntawm halide stoichiometry tswj thiab nto passivation ua rau peb paub zoo heev nyob ze-infrared LEDs nrog lub ncov EQE ntawm 7.7 feem pua, qhov ua tau zoo tshaj plaws kom deb li deb ntawm OLEDs thiab PeLEDs nrog ncov wavelengths tshaj 850 nm.
Daim duab qhia
Daim duab 1 a) TEM duab thiab lub ntsiab lus qhia ntawm Yb3 ntxiv rau: PeNCs, inset ntawm TEM duab qhia cov qauv siv lead ua diffraction. b) XRD pattern, c) IR PLQY, d) PL spectrum, e) Absorption of different halide stoichiometry of Yb3 plus : CsPb(Cl1-xBrx)3 PeNCs. f) Yb3 ntxiv : Lub zog hloov hluav taws xob ntawm PeNCs, peb txoj hauv kev rov ua dua yog suav tias yog (1), (2), thiab (3), raws li. g) TA spectra ntawm xaiv twj tso kua mis-kev sojntsuam ncua. h) Normalized TA teeb liab decay ntawm 450 nm piv rau lub sij hawm rau Yb3 ntxiv: PeNCs nrog txawv nominal doping concentrations.
Fig. 2 a) Schematic daim duab ntawm lub cuab yeej qauv ntawm ze-infrared PeLEDs raws li Yb3 ntxiv : CsPb(Cl1-}xBrx)3 NC emitter. b) Energy band diagram. c) Lub zog faib hluav taws xob ntawm lub teeb hluav taws xob hauv lub ze-infrared LED. d) Raws li EQE thiab J cov yam ntxwv ntawm PeLEDs ntawm Yb3 ntxiv rau : CsPbCl1-xBrx NC emitter, EQE yog suav tias tsuas yog qhov ze-infrared ncov. e) PLQY ntawm PeNC zaj duab xis thiab ncov EQE (qhov tseem ceeb) ntawm NIR PeLEDs ntawm qhov sib txawv excitonic wavelengths. f) EL spectra sib txawv ntawm qhov sib txawv ntawm 3.2 V rau 6 V, nrog ib kauj ruam loj ntawm 0.2V. Lub inset qhia EL spectrum ntawm PeLED ua haujlwm ntawm 3.2 V.
Daim duab 3a) Lub inset qhia cov qauv molecular ntawm BTC. b) EQE - cov yam ntxwv ceev tam sim no. c) Peak EQE histograms ntawm pristine (xiav nkhaus) thiab passivated (liab nkhaus) LED li. JV nkhaus ntawm qhov tsuas yog cov khoom siv d) thiab cov khoom siv hluav taws xob nkaus xwb e) raws li pristine thiab passivated Yb3 ntxiv: PeNCs. Cov kab dub dashed qhia txog qhov ntxiab filling voltage. f) Peak EQE kev sib piv ntawm peb cov khoom siv, yav dhau los tau tshaj tawm NIR PeLDs thiab OLEDs (EL peak wavelengths tshaj 850 nm).
Daim duab 4 a) Nto passivation mechanism ntawm Yb3 ntxiv : PeNCs. XPS spectra ntawm pristine thiab passivated Yb3 ntxiv : Yb 4d; b) XPS spectra of Pb 4f5/2 and 4f7/2 c). d) FTIR kis tau tus mob spectra ntawm benzyl thiocyanate, pristine thiab passivated Yb3 ntxiv: PeNCs. e) Transient PL lwj ntawm pristine thiab passivated Yb3 ntxiv: PeNCs tau ntawm lub wavelength ntawm 480 nm. f) PLQY ntawm residual exciton emission ntawm 480 nm (xiav nkhaus) ntawm PeNCs thiab PLQY ntawm ze-infrared emission ntawm Yb3 ntxiv rau ions ntawm 990 nm (paj liab nkhaus).
