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(a) Schematic diagram of the experimental setup. (b) Measured radiation pattern of the LED array. (c) Measured emission spectrum of the CsPbBr3 perovskite film. Inset: CsPbBr3 perovskite film under 365 nm UV light. (d) Measured emission spectrum of down-converted green light with and without the CLC film (filtered by the long pass filter with 500 nm cutoff wavelength).
