Dataset for "Cool to Warm White Light Emission from Hybrid Inorganic/Organic Light-Emitting Diodes"

This dataset provides the experimental data used to generate the figures in the paper entitled "Cool to Warm White Light Emission from Hybrid Inorganic/Organic Light-Emitting Diodes".

The data discussed and presented in the paper was recorded using an integrating sphere (Labsphere Illumina 600/610). The resultant electroluminescence spectra are corrected for the system response and the intensity is measured in absolute values (W/nm). The LEDs were powered using a Keithley source measure unit, which provided the applied current and voltage values. Parameters such as colour rendering index, correlated colour temperature , chromaticity cordinates, temperature and various efficacy/efficienct values were calculated from the recorded response-corrected spectra and the electrical input power. Absorption spectra were recorded on a Shimadzu UV 2700 instrument. Photoluminescence measurements were recorded using a Perkin-Elmer LS 50 B fluorescence spectrometer in a quartz cuvette (path length 10 mm).

Abstract of the paper:

The synthesis and characterisation of two novel organic down-converting molecules is disclosed, together with their performance as functional colour-converters in combination with inorganic blue light-emitting diodes (LEDs). Each molecule contains two fluorene-triphenylamine arms, connected to either a benzothiadiazole or bisbenzothiadiazole core. These molecules have been selected on the basis that they are free from absorption bands in the green region of the visible spectrum to maximise their performance and offer improvements compared with previous BODIPY-containing analogues. The inorganic InGaN/GaN LED emits at 444 nm, overlying the absorption of each of the organic molecules. The combination of the blue (inorganic) and yellow (organic) emission is shown to produce reasonable quality, white light-emitting hybrid devices for both down-converter molecules. Cool to warm white light is achieved for both molecules by increasing the concentration. An optimum colour rendering index (CRI) value of 66 is obtained for the mono-benzothiadiazole molecule. Also a high blue-to-white efficacy (defined as white luminous flux (lm)/blue radiant flux (W)) of 368 lm/W is achieved, superseding the current phosphor converters of 200-300 lm/W. A comparison of these down-converting molecules to the older generation BODIPY-containing molecules is also provided.