Candles emit sensationally warm light with a very low color temperature, compara-tively most suitable for use at night. In response to the need for such a human-friendly night light, we demonstrate the employment of a high number of candlelight complementary organic emit-ters to generate and mimic candlelight based on organic light emitting diode (OLED). One result-ant candlelight style OLED shows a very-high color rendering index (CRI), with an efficacy at least 300 times that of a candle or at least two times that of an incandescent bulb. The device can be fabricated, for example, by using four candlelight complementary emitters: red, yellow, green, and sky-blue phosphorescent dyes. These dyes, in the present system, can be vacuum deposited into two emission layers that are separated by a nanolayer of carrier modulation material that is used to maximize very high CRI and energy efficiency. A nano carrier modulation layer also played a significant role in maintaining the low blue emission and high-red emission, the low color temperature of device was obtained. Importantly, a romantic sensation giving and suppos-edly physiologically friendly candlelight style emission can hence be driven by electricity in lieu of hydrocarbon burning and greenhouse gas-releasing candles that were invented 5000 years ago. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the origi-nal publication, including its DOI. [DOI: 10.1117/1.JPE.4.043598] Keywords: organic light-emitting diode; candlelight; chromaticity tunable; high-color rendering index and low-color temperature. Paper 13039P received Nov. 28, 2013; revised manuscript received Jan. 14, 2014; accepted for publication Feb. 11, 2014; published online Apr. 11, 2014.