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OLEDs are blue to violet and use phosphors and filters. OLEDs are not "real" LEDs, but limited life and brightness (compared to actual LEDs, called Crystal displays by Sony) electroluminescent diode-like printed dots on TFT based substrates. There are no consumer LED displays, only professional ones. White LEDs don't exist either. They are blue to UV LEDs with yellow phosphor. Some LCD panels use more efficient & longer life red, green and blue LEDs, or blue only.
A QLED screen may be brighter or use less power. QLED uses blue backlights and an LCD panel, with red and green via quantum dots that change the frequency of the blue, but more efficiently than phosphors.
Any power saving by OLED vs LCD depends on program content and LCD backlight type.
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