Domain: Natural Science — Chemistry
Target concept: The solution emits orange-red fluorescence when the ultraviolet lamp is turned on, and the fluorescence disappears immediately after the lamp is turned off.

Video generation prompt: CdSe quantum dot solution (quantum dot diameter: ~5–6 nm) was placed under a UV lamp, and the fluorescence change was recorded by turning the UV lamp on and off.

Evaluation guide:
(i) Target concept: Photoluminescence of semiconductor quantum dots under UV excitation, requiring bandgap-dependent emission and ultrafast radiative recombination.
Minimum mechanism: UV photons must be absorbed by CdSe nanocrystals, promoting electrons to conduction band; subsequent electron-hole recombination must emit photons at ~600–650 nm (orange-red); no persistent phosphorescence or thermal afterglow allowed.
(ii)Storyline: Phase 1 (pre-on): Static shot showing unlit UV lamp + inert solution in vial; solution appears non-fluorescent. Phase 2 (on-trigger): Lamp activates → immediate, full-volume orange-red glow appears *only* within liquid. Phase 3 (off-trigger): Lamp deactivates → glow extinguishes with no perceptible delay, reverting liquid to original non-fluorescent state. Perspective: Fixed frontal medium-close shot, vial centered, no occlusion, full container and lamp base visible; visibility requires clear contrast between glow and ambient background.

Manual:
Experimental Procedure
1. Place a transparent vial containing CdSe quantum dot solution (quantum dot diameter ~5–6 nm) under a UV lamp.
2. Turn the UV lamp ON → observe fluorescence.
3. Turn the UV lamp OFF → observe immediate disappearance of fluorescence.
Observation of Experimental Phenomena
During UV lamp ON: solution emits bright orange-red fluorescence uniformly throughout liquid volume.
During UV lamp OFF: fluorescence vanishes instantly; solution appears pale yellow or nearly colorless.
Summary of Experimental Principles
CdSe quantum dots absorb UV light and re-emit energy as visible orange-red fluorescence (photoluminescence); emission ceases immediately when excitation stops due to nanosecond-scale radiative decay.

Prompt Grounding rubric:
level_1: No UV lamp is shown; no vial or container of CdSe quantum dot solution appears; no on/off action is performed on a lamp; the video does not depict the described setup at all.
level_2: A lamp or a liquid-filled vial appears, but not both; the lamp cannot be identified as a UV lamp (e.g., it only emits ordinary white light with no UV housing cue); the vial is opaque or empty; there is no visible switching action separating a lamp-off state from a lamp-on state.
level_3: A UV lamp (identifiable by a violet/purple glow from its housing or a UV label) and a transparent vial holding the CdSe quantum dot solution are both shown; the lamp is switched on and later switched off, producing two distinct temporal phases within the video; the vial stays in frame and does not move between phases.
level_4: All of the 3-point criteria are met, and the vial's baseline liquid color while the lamp is off is pale yellow, colorless, or faintly amber (matching an unexcited CdSe quantum dot solution, not a deep amber/orange); no extraneous objects block the view of the vial or the lamp in either phase.
level_5: All of the 4-point criteria are met, and the same hand/mechanism operates the lamp switch for both the on and off actions; the vial is centered and occupies a substantial portion of the frame height throughout; the lamp's on/off transition is clearly the visible trigger for the change in the liquid's appearance, with the two phases unambiguously ordered (lamp-on shown, then lamp-off shown).

Scientific and Causal Correctness rubric:
level_1: The liquid shows no fluorescence at all, or glows a color inconsistent with CdSe quantum dots (e.g., blue, green, or white) regardless of lamp state; or the glow appears with no relation to the lamp being on or off.
level_2: The liquid glows during lamp-on, but the color is clearly wrong (e.g., yellow or white rather than orange-red); or the glow visibly lingers for a noticeable stretch of time after the lamp is switched off; or the liquid already looks tinted to match the glow color while the lamp is off.
level_3: Orange-red fluorescence fills the liquid while the lamp is on and is not visible once the lamp is off; the lamp-off liquid looks pale yellow, colorless, or faintly amber rather than glowing; the fluorescence never appears before the lamp is turned on.
level_4: All of the 3-point criteria are met, and the orange-red glow is confined to the liquid itself (no glow from the vial walls or surrounding air); the glow is clearly brighter than the ambient scene while the lamp is on and is essentially gone (no visible residual glow) once the lamp is off; the liquid stays visually calm (no bubbling or swirling) in both phases.
level_5: All of the 4-point criteria are met, and the fluorescence color reads consistently as orange-red (not shifting toward pure red, yellow, or orange) across the whole liquid volume; the glow appears and disappears with no perceptible delay or afterglow to the eye when the lamp switches state; the glowing region does not visibly shift position, shrink, or break apart between the two phases.

Spatiotemporal Consistency rubric:
level_1: The vial's position suddenly changes between shots, or it blinks out of view and back; the lamp's position changes abruptly or the lamp itself vanishes from view only to reappear later; the liquid's surface or shape distorts unnaturally; the background lighting changes for reasons unrelated to the lamp switching (e.g., the whole background darkens exactly when the lamp turns on).
level_2: The vial visibly shifts position between the lamp-on and lamp-off phases; the lamp's on-state glow flickers unevenly instead of holding steady; shadows on the table or vial change direction or strength with no corresponding change in the lamp; the liquid's surface or reflections break continuity (e.g., ripples appear or vanish with no cause).
level_3: The vial stays in the same position and orientation throughout; the lamp stays in the same place and keeps a consistent size and shape; any change in lighting is limited to the UV-glow effect tied to the lamp switching, with the ambient room lighting itself unchanged; the liquid surface stays calm and unchanged in shape across both phases.
level_4: All of the 3-point criteria are met, and the camera viewpoint stays fixed with no panning, tilting, or zooming; the vial shows no parallax shift relative to the background; any motion blur present is consistent with a static setup; there is no sudden shift in overall brightness or color balance between the two phases.
level_5: All of the 4-point criteria are met, and the vial and lamp keep sharp, consistent edges with no warping or stretching; there is no flicker, ghosting, or repeated-frame stutter anywhere in the footage; reflections and highlights on the vial surface remain continuous and do not jump or vanish when the lamp state changes.