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We demonstrate that a simple silver coated ball lens can be used toaccurately measure the entire distribution of radiative transition rates ofquantum dot nanocrystals. This simple and cost-effective implementation ofDrexhage's method that uses nanometer-controlled optical mode densityvariations near a mirror, not only allows to extract calibratedensemble-averaged rates, but for the first time also to quantify the fullinhomogeneous dispersion of radiative and non radiative decay rates acrossthousands of nanocrystals. We apply the technique to novel ultra-stableCdSe/CdS dot-in-rod emitters. The emitters are of large current interest due totheir improved stability and reduced blinking. We retrieve a room-temperatureensemble average quantum efficiency of 0.87+-0.08 at a mean lifetime around 20ns. We confirm a log-normal distribution of decay rates as often assumed inliterature and we show that the rate distribution-width, that amounts to about30% of the mean decay rate, is strongly dependent on the local density ofoptical states.

Calibrating and Controlling the Quantum Efficiency Distribution of Inhomogeneously Broadened Quantum Rods Using a Mirror Ball