A single red neon line loops into a heart at the centre with the word Love inside it, everything around it left true black for AMOLED.
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More Desktop Love Black

Two lens-shaped cutouts stack down a glossy black panel, one rimmed in white light and the lower one glowing red near the bottom edge.3000×5333
Red Neon Ellipses on Dark Glass HD Phone Wallpaper
@stardreams
Thick red and purple liquid coils through the frame like a lava lamp caught mid-flow, small dots scattered across the black between them.2208×4800
Red Liquid Blobs on Black HD Phone Wallpaper
@asterether
Folded paper hearts in bright red rise like flowers from the bottom of a deep maroon-black field.3000×4349
Red Paper Hearts on Thin Stems HD Phone Wallpaper
@noir_1900
A red triangle outline glows among black petals and leaves, most of the frame falling to near-black — deep reds that suit an OLED phone screen.3000×5333
Red Neon Triangle over Dark Flowers HD Phone Wallpaper
@dark_02
A soft gradient runs from near-black purple at the top down to warm red and orange, blurred with no hard edge anywhere.2560×4544
Dark Purple to Red Gradient HD Phone Wallpaper
@shadow_
A wide-body race car drawn in flat grey vector shapes on black, with red ink splatter thrown out behind the rear wing — tall crop, most of the top left empty.2000×4329
Grey Race Car Vector Art with Red Splash HD Phone Wallpaper
@moon_07
Blue and red rods glow along diagonal channels of dark machinery, evenly spread so the pattern reads the same behind app icons.2890×5120
Blue and Red Rods on Black Panels HD Phone Wallpaper
@smoke.pin
Tight vertical crop on the nose of a black Mustang, three LED bars glowing inside the lamp while a wall of blurred red foliage fills the background.3000×4500
Mustang Headlight Close-Up with Red Bokeh HD Phone Wallpaper
@dark_01
Rounded rectangle outlines cross over each other diagonally, shifting from red at the top to deep blue and violet lower down.2340×5070
Overlapping Neon Rectangles in Red and Blue HD Phone Wallpaper
@dreamy_aster
Taut red threads stretch between unseen anchors to form twisting hourglass shapes, the background dropping away to black behind them.3000×4500
Red String Art in the Dark HD Phone Wallpaper
@palettepin
A tall white rectangle hovers between two pyramid-shaped peaks while red mist rolls through the valley, a single figure standing on the near summit.2250×4872
Light Portal Above Red Peaks HD Phone Wallpaper
@obsidianco
A red heart-shaped lock hangs from an iron ring on a studded black door, the only colour in a desaturated frame.3000×4500
Red Heart Padlock on a Dark Door HD Phone Wallpaper
@dusk.pixel